Update handler fixes for Utils bug

.github/workflows/make_tag.yml

@@ -0,0 +1,82 @@
+# This workflow will build a golang project
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go
+
+name: Create Go Release (Tag Versioning)
+
+on:
+  workflow_dispatch:
+    inputs:
+      semver:
+        description: "New Version"
+        required: true
+        default: "patch"
+        type: choice
+        options:
+          - patch
+          - minor
+          - major
+
+jobs:
+  tag_and_commit:
+    name: "Tag and Commit  ${{ github.event.inputs.semver }}"
+    runs-on: linux
+    permissions:
+      contents: write # 'write' access to repository contents
+      pull-requests: write # 'write' access to pull requests
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up Git
+        run: |
+          git config --global user.name "Hein"
+          git config --global user.email "hein.puth@gmail.com"
+
+      - name: Fetch latest tag
+        id: latest_tag
+        run: |
+          git fetch --tags
+          latest_tag=$(git describe --tags `git rev-list --tags --max-count=1`)
+          echo "::set-output name=tag::$latest_tag"
+
+      - name: Determine new tag version
+        id: new_tag
+        run: |
+          current_tag=${{ steps.latest_tag.outputs.tag }}
+          version=$(echo $current_tag | cut -c 2-)  # remove the leading 'v'
+          IFS='.' read -r -a version_parts <<< "$version"
+          major=${version_parts[0]}
+          minor=${version_parts[1]}
+          patch=${version_parts[2]}
+          case "${{ github.event.inputs.semver }}" in
+            "patch")
+              ((patch++))
+              ;;
+            "minor")
+              ((minor++))
+              patch=0
+              ;;
+            "release")
+              ((major++))
+              minor=0
+              patch=0
+              ;;
+            *)
+              echo "Invalid semver input"
+              exit 1
+              ;;
+          esac
+          new_tag="v$major.$minor.$patch"
+          echo "::set-output name=tag::$new_tag"
+
+      - name: Create tag
+        run: |
+          git tag -a ${{ steps.new_tag.outputs.tag }} -m "Tagging ${{ steps.new_tag.outputs.tag }} for release"
+
+      - name: Push changes
+        uses: ad-m/github-push-action@master
+        with:
+          github_token: ${{ secrets.BITECH_GITHUB_TOKEN }}
+          force: true
+          tags: true

.vscode/tasks.json

@@ -230,7 +230,17 @@
 				"cwd": "${workspaceFolder}"
 			},
 			"problemMatcher": [],
-			"group": "test"
+			"group": "build"
+		},
+		{
+			"type": "shell",
+			"label": "go: lint workspace (fix)",
+			"command": "golangci-lint run --timeout=5m --fix",
+			"options": {
+				"cwd": "${workspaceFolder}"
+			},
+			"problemMatcher": [],
+			"group": "build"
 		},
 		{
 			"type": "shell",
@@ -275,4 +285,4 @@
 			"command": "sh ${workspaceFolder}/make_release.sh"
 		}
 	]
-}
+}

pkg/common/adapters/database/bun.go

@@ -196,6 +196,10 @@ func (b *BunAdapter) RunInTransaction(ctx context.Context, fn func(common.Databa
 	})
 }
 
+func (b *BunAdapter) GetUnderlyingDB() interface{} {
+	return b.db
+}
+
 // BunSelectQuery implements SelectQuery for Bun
 type BunSelectQuery struct {
 	query            *bun.SelectQuery
@@ -1208,3 +1212,7 @@ func (b *BunTxAdapter) RollbackTx(ctx context.Context) error {
 func (b *BunTxAdapter) RunInTransaction(ctx context.Context, fn func(common.Database) error) error {
 	return fn(b) // Already in transaction
 }
+
+func (b *BunTxAdapter) GetUnderlyingDB() interface{} {
+	return b.tx
+}

pkg/common/adapters/database/gorm.go

@@ -102,6 +102,10 @@ func (g *GormAdapter) RunInTransaction(ctx context.Context, fn func(common.Datab
 	})
 }
 
+func (g *GormAdapter) GetUnderlyingDB() interface{} {
+	return g.db
+}
+
 // GormSelectQuery implements SelectQuery for GORM
 type GormSelectQuery struct {
 	db             *gorm.DB

pkg/common/adapters/database/pgsql_example.go

@@ -0,0 +1,176 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	_ "github.com/jackc/pgx/v5/stdlib" // PostgreSQL driver
+
+	"github.com/bitechdev/ResolveSpec/pkg/common"
+)
+
+// Example demonstrates how to use the PgSQL adapter
+func ExamplePgSQLAdapter() error {
+	// Connect to PostgreSQL database
+	dsn := "postgres://username:password@localhost:5432/dbname?sslmode=disable"
+	db, err := sql.Open("pgx", dsn)
+	if err != nil {
+		return fmt.Errorf("failed to open database: %w", err)
+	}
+	defer db.Close()
+
+	// Create the PgSQL adapter
+	adapter := NewPgSQLAdapter(db)
+
+	// Enable query debugging (optional)
+	adapter.EnableQueryDebug()
+
+	ctx := context.Background()
+
+	// Example 1: Simple SELECT query
+	var results []map[string]interface{}
+	err = adapter.NewSelect().
+		Table("users").
+		Where("age > ?", 18).
+		Order("created_at DESC").
+		Limit(10).
+		Scan(ctx, &results)
+	if err != nil {
+		return fmt.Errorf("select failed: %w", err)
+	}
+
+	// Example 2: INSERT query
+	result, err := adapter.NewInsert().
+		Table("users").
+		Value("name", "John Doe").
+		Value("email", "john@example.com").
+		Value("age", 25).
+		Returning("id").
+		Exec(ctx)
+	if err != nil {
+		return fmt.Errorf("insert failed: %w", err)
+	}
+	fmt.Printf("Rows affected: %d\n", result.RowsAffected())
+
+	// Example 3: UPDATE query
+	result, err = adapter.NewUpdate().
+		Table("users").
+		Set("name", "Jane Doe").
+		Where("id = ?", 1).
+		Exec(ctx)
+	if err != nil {
+		return fmt.Errorf("update failed: %w", err)
+	}
+	fmt.Printf("Rows updated: %d\n", result.RowsAffected())
+
+	// Example 4: DELETE query
+	result, err = adapter.NewDelete().
+		Table("users").
+		Where("age < ?", 18).
+		Exec(ctx)
+	if err != nil {
+		return fmt.Errorf("delete failed: %w", err)
+	}
+	fmt.Printf("Rows deleted: %d\n", result.RowsAffected())
+
+	// Example 5: Using transactions
+	err = adapter.RunInTransaction(ctx, func(tx common.Database) error {
+		// Insert a new user
+		_, err := tx.NewInsert().
+			Table("users").
+			Value("name", "Transaction User").
+			Value("email", "tx@example.com").
+			Exec(ctx)
+		if err != nil {
+			return err
+		}
+
+		// Update another user
+		_, err = tx.NewUpdate().
+			Table("users").
+			Set("verified", true).
+			Where("email = ?", "tx@example.com").
+			Exec(ctx)
+		if err != nil {
+			return err
+		}
+
+		// Both operations succeed or both rollback
+		return nil
+	})
+	if err != nil {
+		return fmt.Errorf("transaction failed: %w", err)
+	}
+
+	// Example 6: JOIN query
+	err = adapter.NewSelect().
+		Table("users u").
+		Column("u.id", "u.name", "p.title as post_title").
+		LeftJoin("posts p ON p.user_id = u.id").
+		Where("u.active = ?", true).
+		Scan(ctx, &results)
+	if err != nil {
+		return fmt.Errorf("join query failed: %w", err)
+	}
+
+	// Example 7: Aggregation query
+	count, err := adapter.NewSelect().
+		Table("users").
+		Where("active = ?", true).
+		Count(ctx)
+	if err != nil {
+		return fmt.Errorf("count failed: %w", err)
+	}
+	fmt.Printf("Active users: %d\n", count)
+
+	// Example 8: Raw SQL execution
+	_, err = adapter.Exec(ctx, "CREATE INDEX IF NOT EXISTS idx_users_email ON users(email)")
+	if err != nil {
+		return fmt.Errorf("raw exec failed: %w", err)
+	}
+
+	// Example 9: Raw SQL query
+	var users []map[string]interface{}
+	err = adapter.Query(ctx, &users, "SELECT * FROM users WHERE age > $1 LIMIT $2", 18, 10)
+	if err != nil {
+		return fmt.Errorf("raw query failed: %w", err)
+	}
+
+	return nil
+}
+
+// User is an example model
+type User struct {
+	ID    int    `json:"id"`
+	Name  string `json:"name"`
+	Email string `json:"email"`
+	Age   int    `json:"age"`
+}
+
+// TableName implements common.TableNameProvider
+func (u User) TableName() string {
+	return "users"
+}
+
+// ExampleWithModel demonstrates using models with the PgSQL adapter
+func ExampleWithModel() error {
+	dsn := "postgres://username:password@localhost:5432/dbname?sslmode=disable"
+	db, err := sql.Open("pgx", dsn)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Use model with adapter
+	user := User{}
+	err = adapter.NewSelect().
+		Model(&user).
+		Where("id = ?", 1).
+		Scan(ctx, &user)
+
+	return err
+}

pkg/common/adapters/database/pgsql_integration_test.go

@@ -0,0 +1,526 @@
+// +build integration
+
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"testing"
+	"time"
+
+	_ "github.com/jackc/pgx/v5/stdlib"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/testcontainers/testcontainers-go"
+	"github.com/testcontainers/testcontainers-go/wait"
+)
+
+// Integration test models
+type IntegrationUser struct {
+	ID        int       `db:"id"`
+	Name      string    `db:"name"`
+	Email     string    `db:"email"`
+	Age       int       `db:"age"`
+	CreatedAt time.Time `db:"created_at"`
+	Posts     []*IntegrationPost `bun:"rel:has-many,join:id=user_id"`
+}
+
+func (u IntegrationUser) TableName() string {
+	return "users"
+}
+
+type IntegrationPost struct {
+	ID        int                   `db:"id"`
+	Title     string                `db:"title"`
+	Content   string                `db:"content"`
+	UserID    int                   `db:"user_id"`
+	Published bool                  `db:"published"`
+	CreatedAt time.Time             `db:"created_at"`
+	User      *IntegrationUser      `bun:"rel:belongs-to,join:user_id=id"`
+	Comments  []*IntegrationComment `bun:"rel:has-many,join:id=post_id"`
+}
+
+func (p IntegrationPost) TableName() string {
+	return "posts"
+}
+
+type IntegrationComment struct {
+	ID        int       `db:"id"`
+	Content   string    `db:"content"`
+	PostID    int       `db:"post_id"`
+	CreatedAt time.Time `db:"created_at"`
+	Post      *IntegrationPost `bun:"rel:belongs-to,join:post_id=id"`
+}
+
+func (c IntegrationComment) TableName() string {
+	return "comments"
+}
+
+// setupTestDB creates a PostgreSQL container and returns the connection
+func setupTestDB(t *testing.T) (*sql.DB, func()) {
+	ctx := context.Background()
+
+	req := testcontainers.ContainerRequest{
+		Image:        "postgres:15-alpine",
+		ExposedPorts: []string{"5432/tcp"},
+		Env: map[string]string{
+			"POSTGRES_USER":     "testuser",
+			"POSTGRES_PASSWORD": "testpass",
+			"POSTGRES_DB":       "testdb",
+		},
+		WaitingFor: wait.ForLog("database system is ready to accept connections").
+			WithOccurrence(2).
+			WithStartupTimeout(60 * time.Second),
+	}
+
+	postgres, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
+		ContainerRequest: req,
+		Started:          true,
+	})
+	require.NoError(t, err)
+
+	host, err := postgres.Host(ctx)
+	require.NoError(t, err)
+
+	port, err := postgres.MappedPort(ctx, "5432")
+	require.NoError(t, err)
+
+	dsn := fmt.Sprintf("postgres://testuser:testpass@%s:%s/testdb?sslmode=disable",
+		host, port.Port())
+
+	db, err := sql.Open("pgx", dsn)
+	require.NoError(t, err)
+
+	// Wait for database to be ready
+	err = db.Ping()
+	require.NoError(t, err)
+
+	// Create schema
+	createSchema(t, db)
+
+	cleanup := func() {
+		db.Close()
+		postgres.Terminate(ctx)
+	}
+
+	return db, cleanup
+}
+
+// createSchema creates test tables
+func createSchema(t *testing.T, db *sql.DB) {
+	schema := `
+		DROP TABLE IF EXISTS comments CASCADE;
+		DROP TABLE IF EXISTS posts CASCADE;
+		DROP TABLE IF EXISTS users CASCADE;
+
+		CREATE TABLE users (
+			id SERIAL PRIMARY KEY,
+			name VARCHAR(255) NOT NULL,
+			email VARCHAR(255) UNIQUE NOT NULL,
+			age INT NOT NULL,
+			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+		);
+
+		CREATE TABLE posts (
+			id SERIAL PRIMARY KEY,
+			title VARCHAR(255) NOT NULL,
+			content TEXT NOT NULL,
+			user_id INT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+			published BOOLEAN DEFAULT false,
+			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+		);
+
+		CREATE TABLE comments (
+			id SERIAL PRIMARY KEY,
+			content TEXT NOT NULL,
+			post_id INT NOT NULL REFERENCES posts(id) ON DELETE CASCADE,
+			created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+		);
+	`
+
+	_, err := db.Exec(schema)
+	require.NoError(t, err)
+}
+
+// TestIntegration_BasicCRUD tests basic CRUD operations
+func TestIntegration_BasicCRUD(t *testing.T) {
+	db, cleanup := setupTestDB(t)
+	defer cleanup()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// CREATE
+	result, err := adapter.NewInsert().
+		Table("users").
+		Value("name", "John Doe").
+		Value("email", "john@example.com").
+		Value("age", 25).
+		Exec(ctx)
+
+	require.NoError(t, err)
+	assert.Equal(t, int64(1), result.RowsAffected())
+
+	// READ
+	var users []IntegrationUser
+	err = adapter.NewSelect().
+		Table("users").
+		Where("email = ?", "john@example.com").
+		Scan(ctx, &users)
+
+	require.NoError(t, err)
+	assert.Len(t, users, 1)
+	assert.Equal(t, "John Doe", users[0].Name)
+	assert.Equal(t, 25, users[0].Age)
+
+	userID := users[0].ID
+
+	// UPDATE
+	result, err = adapter.NewUpdate().
+		Table("users").
+		Set("age", 26).
+		Where("id = ?", userID).
+		Exec(ctx)
+
+	require.NoError(t, err)
+	assert.Equal(t, int64(1), result.RowsAffected())
+
+	// Verify update
+	var updatedUser IntegrationUser
+	err = adapter.NewSelect().
+		Table("users").
+		Where("id = ?", userID).
+		Scan(ctx, &updatedUser)
+
+	require.NoError(t, err)
+	assert.Equal(t, 26, updatedUser.Age)
+
+	// DELETE
+	result, err = adapter.NewDelete().
+		Table("users").
+		Where("id = ?", userID).
+		Exec(ctx)
+
+	require.NoError(t, err)
+	assert.Equal(t, int64(1), result.RowsAffected())
+
+	// Verify delete
+	count, err := adapter.NewSelect().
+		Table("users").
+		Where("id = ?", userID).
+		Count(ctx)
+
+	require.NoError(t, err)
+	assert.Equal(t, 0, count)
+}
+
+// TestIntegration_ScanModel tests ScanModel functionality
+func TestIntegration_ScanModel(t *testing.T) {
+	db, cleanup := setupTestDB(t)
+	defer cleanup()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Insert test data
+	_, err := adapter.NewInsert().
+		Table("users").
+		Value("name", "Jane Smith").
+		Value("email", "jane@example.com").
+		Value("age", 30).
+		Exec(ctx)
+	require.NoError(t, err)
+
+	// Test single struct scan
+	user := &IntegrationUser{}
+	err = adapter.NewSelect().
+		Model(user).
+		Table("users").
+		Where("email = ?", "jane@example.com").
+		ScanModel(ctx)
+
+	require.NoError(t, err)
+	assert.Equal(t, "Jane Smith", user.Name)
+	assert.Equal(t, 30, user.Age)
+
+	// Test slice scan
+	users := []*IntegrationUser{}
+	err = adapter.NewSelect().
+		Model(&users).
+		Table("users").
+		ScanModel(ctx)
+
+	require.NoError(t, err)
+	assert.Len(t, users, 1)
+}
+
+// TestIntegration_Transaction tests transaction handling
+func TestIntegration_Transaction(t *testing.T) {
+	db, cleanup := setupTestDB(t)
+	defer cleanup()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Successful transaction
+	err := adapter.RunInTransaction(ctx, func(tx common.Database) error {
+		_, err := tx.NewInsert().
+			Table("users").
+			Value("name", "Alice").
+			Value("email", "alice@example.com").
+			Value("age", 28).
+			Exec(ctx)
+		if err != nil {
+			return err
+		}
+
+		_, err = tx.NewInsert().
+			Table("users").
+			Value("name", "Bob").
+			Value("email", "bob@example.com").
+			Value("age", 32).
+			Exec(ctx)
+		return err
+	})
+
+	require.NoError(t, err)
+
+	// Verify both records exist
+	count, err := adapter.NewSelect().
+		Table("users").
+		Count(ctx)
+	require.NoError(t, err)
+	assert.Equal(t, 2, count)
+
+	// Failed transaction (should rollback)
+	err = adapter.RunInTransaction(ctx, func(tx common.Database) error {
+		_, err := tx.NewInsert().
+			Table("users").
+			Value("name", "Charlie").
+			Value("email", "charlie@example.com").
+			Value("age", 35).
+			Exec(ctx)
+		if err != nil {
+			return err
+		}
+
+		// Intentional error - duplicate email
+		_, err = tx.NewInsert().
+			Table("users").
+			Value("name", "David").
+			Value("email", "alice@example.com"). // Duplicate
+			Value("age", 40).
+			Exec(ctx)
+		return err
+	})
+
+	assert.Error(t, err)
+
+	// Verify rollback - count should still be 2
+	count, err = adapter.NewSelect().
+		Table("users").
+		Count(ctx)
+	require.NoError(t, err)
+	assert.Equal(t, 2, count)
+}
+
+// TestIntegration_Preload tests basic preload functionality
+func TestIntegration_Preload(t *testing.T) {
+	db, cleanup := setupTestDB(t)
+	defer cleanup()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Create test data
+	userID := createTestUser(t, adapter, ctx, "John Doe", "john@example.com", 25)
+	createTestPost(t, adapter, ctx, userID, "First Post", "Content 1", true)
+	createTestPost(t, adapter, ctx, userID, "Second Post", "Content 2", false)
+
+	// Test Preload
+	var users []*IntegrationUser
+	err := adapter.NewSelect().
+		Model(&IntegrationUser{}).
+		Table("users").
+		Preload("Posts").
+		Scan(ctx, &users)
+
+	require.NoError(t, err)
+	assert.Len(t, users, 1)
+	assert.NotNil(t, users[0].Posts)
+	assert.Len(t, users[0].Posts, 2)
+}
+
+// TestIntegration_PreloadRelation tests smart PreloadRelation
+func TestIntegration_PreloadRelation(t *testing.T) {
+	db, cleanup := setupTestDB(t)
+	defer cleanup()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Create test data
+	userID := createTestUser(t, adapter, ctx, "Jane Smith", "jane@example.com", 30)
+	postID := createTestPost(t, adapter, ctx, userID, "Test Post", "Test Content", true)
+	createTestComment(t, adapter, ctx, postID, "Great post!")
+	createTestComment(t, adapter, ctx, postID, "Thanks for sharing!")
+
+	// Test PreloadRelation with belongs-to (should use JOIN)
+	var posts []*IntegrationPost
+	err := adapter.NewSelect().
+		Model(&IntegrationPost{}).
+		Table("posts").
+		PreloadRelation("User").
+		Scan(ctx, &posts)
+
+	require.NoError(t, err)
+	assert.Len(t, posts, 1)
+	// Note: JOIN preloading needs proper column selection to work
+	// For now, we test that it doesn't error
+
+	// Test PreloadRelation with has-many (should use subquery)
+	posts = []*IntegrationPost{}
+	err = adapter.NewSelect().
+		Model(&IntegrationPost{}).
+		Table("posts").
+		PreloadRelation("Comments").
+		Scan(ctx, &posts)
+
+	require.NoError(t, err)
+	assert.Len(t, posts, 1)
+	if posts[0].Comments != nil {
+		assert.Len(t, posts[0].Comments, 2)
+	}
+}
+
+// TestIntegration_JoinRelation tests explicit JoinRelation
+func TestIntegration_JoinRelation(t *testing.T) {
+	db, cleanup := setupTestDB(t)
+	defer cleanup()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Create test data
+	userID := createTestUser(t, adapter, ctx, "Bob Wilson", "bob@example.com", 35)
+	createTestPost(t, adapter, ctx, userID, "Join Test", "Content", true)
+
+	// Test JoinRelation
+	var posts []*IntegrationPost
+	err := adapter.NewSelect().
+		Model(&IntegrationPost{}).
+		Table("posts").
+		JoinRelation("User").
+		Scan(ctx, &posts)
+
+	require.NoError(t, err)
+	assert.Len(t, posts, 1)
+}
+
+// TestIntegration_ComplexQuery tests complex queries
+func TestIntegration_ComplexQuery(t *testing.T) {
+	db, cleanup := setupTestDB(t)
+	defer cleanup()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Create test data
+	userID1 := createTestUser(t, adapter, ctx, "Alice", "alice@example.com", 25)
+	userID2 := createTestUser(t, adapter, ctx, "Bob", "bob@example.com", 30)
+	userID3 := createTestUser(t, adapter, ctx, "Charlie", "charlie@example.com", 35)
+
+	createTestPost(t, adapter, ctx, userID1, "Post 1", "Content", true)
+	createTestPost(t, adapter, ctx, userID2, "Post 2", "Content", true)
+	createTestPost(t, adapter, ctx, userID3, "Post 3", "Content", false)
+
+	// Complex query with joins, where, order, limit
+	var results []map[string]interface{}
+	err := adapter.NewSelect().
+		Table("posts p").
+		Column("p.title", "u.name as author_name", "u.age as author_age").
+		LeftJoin("users u ON u.id = p.user_id").
+		Where("p.published = ?", true).
+		WhereOr("u.age > ?", 25).
+		Order("u.age DESC").
+		Limit(2).
+		Scan(ctx, &results)
+
+	require.NoError(t, err)
+	assert.LessOrEqual(t, len(results), 2)
+}
+
+// TestIntegration_Aggregation tests aggregation queries
+func TestIntegration_Aggregation(t *testing.T) {
+	db, cleanup := setupTestDB(t)
+	defer cleanup()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Create test data
+	createTestUser(t, adapter, ctx, "User 1", "user1@example.com", 20)
+	createTestUser(t, adapter, ctx, "User 2", "user2@example.com", 25)
+	createTestUser(t, adapter, ctx, "User 3", "user3@example.com", 30)
+
+	// Test Count
+	count, err := adapter.NewSelect().
+		Table("users").
+		Where("age >= ?", 25).
+		Count(ctx)
+
+	require.NoError(t, err)
+	assert.Equal(t, 2, count)
+
+	// Test Exists
+	exists, err := adapter.NewSelect().
+		Table("users").
+		Where("email = ?", "user1@example.com").
+		Exists(ctx)
+
+	require.NoError(t, err)
+	assert.True(t, exists)
+
+	// Test Group By with aggregation
+	var results []map[string]interface{}
+	err = adapter.NewSelect().
+		Table("users").
+		Column("age", "COUNT(*) as count").
+		Group("age").
+		Having("COUNT(*) > ?", 0).
+		Order("age ASC").
+		Scan(ctx, &results)
+
+	require.NoError(t, err)
+	assert.Len(t, results, 3)
+}
+
+// Helper functions
+
+func createTestUser(t *testing.T, adapter *PgSQLAdapter, ctx context.Context, name, email string, age int) int {
+	var userID int
+	err := adapter.Query(ctx, &userID,
+		"INSERT INTO users (name, email, age) VALUES ($1, $2, $3) RETURNING id",
+		name, email, age)
+	require.NoError(t, err)
+	return userID
+}
+
+func createTestPost(t *testing.T, adapter *PgSQLAdapter, ctx context.Context, userID int, title, content string, published bool) int {
+	var postID int
+	err := adapter.Query(ctx, &postID,
+		"INSERT INTO posts (title, content, user_id, published) VALUES ($1, $2, $3, $4) RETURNING id",
+		title, content, userID, published)
+	require.NoError(t, err)
+	return postID
+}
+
+func createTestComment(t *testing.T, adapter *PgSQLAdapter, ctx context.Context, postID int, content string) int {
+	var commentID int
+	err := adapter.Query(ctx, &commentID,
+		"INSERT INTO comments (content, post_id) VALUES ($1, $2) RETURNING id",
+		content, postID)
+	require.NoError(t, err)
+	return commentID
+}

pkg/common/adapters/database/pgsql_preload_example.go

@@ -0,0 +1,275 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+
+	_ "github.com/jackc/pgx/v5/stdlib"
+
+	"github.com/bitechdev/ResolveSpec/pkg/common"
+)
+
+// Example models for demonstrating preload functionality
+
+// Author model - has many Posts
+type Author struct {
+	ID    int     `db:"id"`
+	Name  string  `db:"name"`
+	Email string  `db:"email"`
+	Posts []*Post `bun:"rel:has-many,join:id=author_id"`
+}
+
+func (a Author) TableName() string {
+	return "authors"
+}
+
+// Post model - belongs to Author, has many Comments
+type Post struct {
+	ID       int        `db:"id"`
+	Title    string     `db:"title"`
+	Content  string     `db:"content"`
+	AuthorID int        `db:"author_id"`
+	Author   *Author    `bun:"rel:belongs-to,join:author_id=id"`
+	Comments []*Comment `bun:"rel:has-many,join:id=post_id"`
+}
+
+func (p Post) TableName() string {
+	return "posts"
+}
+
+// Comment model - belongs to Post
+type Comment struct {
+	ID      int    `db:"id"`
+	Content string `db:"content"`
+	PostID  int    `db:"post_id"`
+	Post    *Post  `bun:"rel:belongs-to,join:post_id=id"`
+}
+
+func (c Comment) TableName() string {
+	return "comments"
+}
+
+// ExamplePreload demonstrates the Preload functionality
+func ExamplePreload() error {
+	dsn := "postgres://username:password@localhost:5432/dbname?sslmode=disable"
+	db, err := sql.Open("pgx", dsn)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Example 1: Simple Preload (uses subquery for has-many)
+	var authors []*Author
+	err = adapter.NewSelect().
+		Model(&Author{}).
+		Table("authors").
+		Preload("Posts"). // Load all posts for each author
+		Scan(ctx, &authors)
+	if err != nil {
+		return err
+	}
+
+	// Now authors[i].Posts will be populated with their posts
+
+	return nil
+}
+
+// ExamplePreloadRelation demonstrates smart PreloadRelation with auto-detection
+func ExamplePreloadRelation() error {
+	dsn := "postgres://username:password@localhost:5432/dbname?sslmode=disable"
+	db, err := sql.Open("pgx", dsn)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Example 1: PreloadRelation auto-detects has-many (uses subquery)
+	var authors []*Author
+	err = adapter.NewSelect().
+		Model(&Author{}).
+		Table("authors").
+		PreloadRelation("Posts", func(q common.SelectQuery) common.SelectQuery {
+			return q.Where("published = ?", true).Order("created_at DESC")
+		}).
+		Where("active = ?", true).
+		Scan(ctx, &authors)
+	if err != nil {
+		return err
+	}
+
+	// Example 2: PreloadRelation auto-detects belongs-to (uses JOIN)
+	var posts []*Post
+	err = adapter.NewSelect().
+		Model(&Post{}).
+		Table("posts").
+		PreloadRelation("Author"). // Will use JOIN because it's belongs-to
+		Scan(ctx, &posts)
+	if err != nil {
+		return err
+	}
+
+	// Example 3: Nested preloads
+	err = adapter.NewSelect().
+		Model(&Author{}).
+		Table("authors").
+		PreloadRelation("Posts", func(q common.SelectQuery) common.SelectQuery {
+			// First load posts, then preload comments for each post
+			return q.Limit(10)
+		}).
+		Scan(ctx, &authors)
+	if err != nil {
+		return err
+	}
+
+	// Manually load nested relationships (two-level preloading)
+	for _, author := range authors {
+		if author.Posts != nil {
+			for _, post := range author.Posts {
+				var comments []*Comment
+				err := adapter.NewSelect().
+					Table("comments").
+					Where("post_id = ?", post.ID).
+					Scan(ctx, &comments)
+				if err == nil {
+					post.Comments = comments
+				}
+			}
+		}
+	}
+
+	return nil
+}
+
+// ExampleJoinRelation demonstrates explicit JOIN loading
+func ExampleJoinRelation() error {
+	dsn := "postgres://username:password@localhost:5432/dbname?sslmode=disable"
+	db, err := sql.Open("pgx", dsn)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Example 1: Force JOIN for belongs-to relationship
+	var posts []*Post
+	err = adapter.NewSelect().
+		Model(&Post{}).
+		Table("posts").
+		JoinRelation("Author", func(q common.SelectQuery) common.SelectQuery {
+			return q.Where("active = ?", true)
+		}).
+		Scan(ctx, &posts)
+	if err != nil {
+		return err
+	}
+
+	// Example 2: Multiple JOINs
+	err = adapter.NewSelect().
+		Model(&Post{}).
+		Table("posts p").
+		Column("p.*", "a.name as author_name", "a.email as author_email").
+		LeftJoin("authors a ON a.id = p.author_id").
+		Where("p.published = ?", true).
+		Scan(ctx, &posts)
+
+	return err
+}
+
+// ExampleScanModel demonstrates ScanModel with struct destinations
+func ExampleScanModel() error {
+	dsn := "postgres://username:password@localhost:5432/dbname?sslmode=disable"
+	db, err := sql.Open("pgx", dsn)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	// Example 1: Scan single struct
+	author := Author{}
+	err = adapter.NewSelect().
+		Model(&author).
+		Table("authors").
+		Where("id = ?", 1).
+		ScanModel(ctx) // ScanModel automatically uses the model set with Model()
+
+	if err != nil {
+		return err
+	}
+
+	// Example 2: Scan slice of structs
+	authors := []*Author{}
+	err = adapter.NewSelect().
+		Model(&authors).
+		Table("authors").
+		Where("active = ?", true).
+		Limit(10).
+		ScanModel(ctx)
+
+	return err
+}
+
+// ExampleCompleteWorkflow demonstrates a complete workflow with preloading
+func ExampleCompleteWorkflow() error {
+	dsn := "postgres://username:password@localhost:5432/dbname?sslmode=disable"
+	db, err := sql.Open("pgx", dsn)
+	if err != nil {
+		return err
+	}
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+	adapter.EnableQueryDebug() // Enable query logging
+	ctx := context.Background()
+
+	// Step 1: Create an author
+	author := &Author{
+		Name:  "John Doe",
+		Email: "john@example.com",
+	}
+
+	result, err := adapter.NewInsert().
+		Table("authors").
+		Value("name", author.Name).
+		Value("email", author.Email).
+		Returning("id").
+		Exec(ctx)
+	if err != nil {
+		return err
+	}
+
+	_ = result
+
+	// Step 2: Load author with all their posts
+	var loadedAuthor Author
+	err = adapter.NewSelect().
+		Model(&loadedAuthor).
+		Table("authors").
+		PreloadRelation("Posts", func(q common.SelectQuery) common.SelectQuery {
+			return q.Order("created_at DESC").Limit(5)
+		}).
+		Where("id = ?", 1).
+		ScanModel(ctx)
+	if err != nil {
+		return err
+	}
+
+	// Step 3: Update author name
+	_, err = adapter.NewUpdate().
+		Table("authors").
+		Set("name", "Jane Doe").
+		Where("id = ?", 1).
+		Exec(ctx)
+
+	return err
+}

pkg/common/adapters/database/pgsql_test.go

@@ -0,0 +1,629 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"reflect"
+	"testing"
+
+	"github.com/DATA-DOG/go-sqlmock"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/bitechdev/ResolveSpec/pkg/common"
+)
+
+// Test models
+type TestUser struct {
+	ID    int    `db:"id"`
+	Name  string `db:"name"`
+	Email string `db:"email"`
+	Age   int    `db:"age"`
+}
+
+func (u TestUser) TableName() string {
+	return "users"
+}
+
+type TestPost struct {
+	ID       int        `db:"id"`
+	Title    string     `db:"title"`
+	Content  string     `db:"content"`
+	UserID   int        `db:"user_id"`
+	User     *TestUser  `bun:"rel:belongs-to,join:user_id=id"`
+	Comments []TestComment `bun:"rel:has-many,join:id=post_id"`
+}
+
+func (p TestPost) TableName() string {
+	return "posts"
+}
+
+type TestComment struct {
+	ID      int    `db:"id"`
+	Content string `db:"content"`
+	PostID  int    `db:"post_id"`
+}
+
+func (c TestComment) TableName() string {
+	return "comments"
+}
+
+// TestNewPgSQLAdapter tests adapter creation
+func TestNewPgSQLAdapter(t *testing.T) {
+	db, _, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+	assert.NotNil(t, adapter)
+	assert.Equal(t, db, adapter.db)
+}
+
+// TestPgSQLSelectQuery_BuildSQL tests SQL query building
+func TestPgSQLSelectQuery_BuildSQL(t *testing.T) {
+	tests := []struct {
+		name     string
+		setup    func(*PgSQLSelectQuery)
+		expected string
+	}{
+		{
+			name: "simple select",
+			setup: func(q *PgSQLSelectQuery) {
+				q.tableName = "users"
+			},
+			expected: "SELECT * FROM users",
+		},
+		{
+			name: "select with columns",
+			setup: func(q *PgSQLSelectQuery) {
+				q.tableName = "users"
+				q.columns = []string{"id", "name", "email"}
+			},
+			expected: "SELECT id, name, email FROM users",
+		},
+		{
+			name: "select with where",
+			setup: func(q *PgSQLSelectQuery) {
+				q.tableName = "users"
+				q.whereClauses = []string{"age > $1"}
+				q.args = []interface{}{18}
+			},
+			expected: "SELECT * FROM users WHERE (age > $1)",
+		},
+		{
+			name: "select with order and limit",
+			setup: func(q *PgSQLSelectQuery) {
+				q.tableName = "users"
+				q.orderBy = []string{"created_at DESC"}
+				q.limit = 10
+				q.offset = 5
+			},
+			expected: "SELECT * FROM users ORDER BY created_at DESC LIMIT 10 OFFSET 5",
+		},
+		{
+			name: "select with join",
+			setup: func(q *PgSQLSelectQuery) {
+				q.tableName = "users"
+				q.joins = []string{"LEFT JOIN posts ON posts.user_id = users.id"}
+			},
+			expected: "SELECT * FROM users LEFT JOIN posts ON posts.user_id = users.id",
+		},
+		{
+			name: "select with group and having",
+			setup: func(q *PgSQLSelectQuery) {
+				q.tableName = "users"
+				q.groupBy = []string{"country"}
+				q.havingClauses = []string{"COUNT(*) > $1"}
+				q.args = []interface{}{5}
+			},
+			expected: "SELECT * FROM users GROUP BY country HAVING COUNT(*) > $1",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			q := &PgSQLSelectQuery{
+				columns: []string{"*"},
+			}
+			tt.setup(q)
+			sql := q.buildSQL()
+			assert.Equal(t, tt.expected, sql)
+		})
+	}
+}
+
+// TestPgSQLSelectQuery_ReplacePlaceholders tests placeholder replacement
+func TestPgSQLSelectQuery_ReplacePlaceholders(t *testing.T) {
+	tests := []struct {
+		name         string
+		query        string
+		argCount     int
+		paramCounter int
+		expected     string
+	}{
+		{
+			name:         "single placeholder",
+			query:        "age > ?",
+			argCount:     1,
+			paramCounter: 0,
+			expected:     "age > $1",
+		},
+		{
+			name:         "multiple placeholders",
+			query:        "age > ? AND status = ?",
+			argCount:     2,
+			paramCounter: 0,
+			expected:     "age > $1 AND status = $2",
+		},
+		{
+			name:         "with existing counter",
+			query:        "name = ?",
+			argCount:     1,
+			paramCounter: 5,
+			expected:     "name = $6",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			q := &PgSQLSelectQuery{paramCounter: tt.paramCounter}
+			result := q.replacePlaceholders(tt.query, tt.argCount)
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}
+
+// TestPgSQLSelectQuery_Chaining tests method chaining
+func TestPgSQLSelectQuery_Chaining(t *testing.T) {
+	db, _, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+	query := adapter.NewSelect().
+		Table("users").
+		Column("id", "name").
+		Where("age > ?", 18).
+		Order("name ASC").
+		Limit(10).
+		Offset(5)
+
+	pgQuery := query.(*PgSQLSelectQuery)
+	assert.Equal(t, "users", pgQuery.tableName)
+	assert.Equal(t, []string{"id", "name"}, pgQuery.columns)
+	assert.Len(t, pgQuery.whereClauses, 1)
+	assert.Equal(t, []string{"name ASC"}, pgQuery.orderBy)
+	assert.Equal(t, 10, pgQuery.limit)
+	assert.Equal(t, 5, pgQuery.offset)
+}
+
+// TestPgSQLSelectQuery_Model tests model setting
+func TestPgSQLSelectQuery_Model(t *testing.T) {
+	db, _, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+	user := &TestUser{}
+	query := adapter.NewSelect().Model(user)
+
+	pgQuery := query.(*PgSQLSelectQuery)
+	assert.Equal(t, "users", pgQuery.tableName)
+	assert.Equal(t, user, pgQuery.model)
+}
+
+// TestScanRowsToStructSlice tests scanning rows into struct slice
+func TestScanRowsToStructSlice(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	rows := sqlmock.NewRows([]string{"id", "name", "email", "age"}).
+		AddRow(1, "John Doe", "john@example.com", 25).
+		AddRow(2, "Jane Smith", "jane@example.com", 30)
+
+	mock.ExpectQuery("SELECT (.+) FROM users").WillReturnRows(rows)
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	var users []TestUser
+	err = adapter.NewSelect().
+		Table("users").
+		Scan(ctx, &users)
+
+	require.NoError(t, err)
+	assert.Len(t, users, 2)
+	assert.Equal(t, "John Doe", users[0].Name)
+	assert.Equal(t, "jane@example.com", users[1].Email)
+	assert.Equal(t, 30, users[1].Age)
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestScanRowsToStructSlicePointers tests scanning rows into pointer slice
+func TestScanRowsToStructSlicePointers(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	rows := sqlmock.NewRows([]string{"id", "name", "email", "age"}).
+		AddRow(1, "John Doe", "john@example.com", 25)
+
+	mock.ExpectQuery("SELECT (.+) FROM users").WillReturnRows(rows)
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	var users []*TestUser
+	err = adapter.NewSelect().
+		Table("users").
+		Scan(ctx, &users)
+
+	require.NoError(t, err)
+	assert.Len(t, users, 1)
+	assert.NotNil(t, users[0])
+	assert.Equal(t, "John Doe", users[0].Name)
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestScanRowsToSingleStruct tests scanning a single row
+func TestScanRowsToSingleStruct(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	rows := sqlmock.NewRows([]string{"id", "name", "email", "age"}).
+		AddRow(1, "John Doe", "john@example.com", 25)
+
+	mock.ExpectQuery("SELECT (.+) FROM users").WillReturnRows(rows)
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	var user TestUser
+	err = adapter.NewSelect().
+		Table("users").
+		Where("id = ?", 1).
+		Scan(ctx, &user)
+
+	require.NoError(t, err)
+	assert.Equal(t, 1, user.ID)
+	assert.Equal(t, "John Doe", user.Name)
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestScanRowsToMapSlice tests scanning into map slice
+func TestScanRowsToMapSlice(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	rows := sqlmock.NewRows([]string{"id", "name", "email"}).
+		AddRow(1, "John Doe", "john@example.com").
+		AddRow(2, "Jane Smith", "jane@example.com")
+
+	mock.ExpectQuery("SELECT (.+) FROM users").WillReturnRows(rows)
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	var results []map[string]interface{}
+	err = adapter.NewSelect().
+		Table("users").
+		Scan(ctx, &results)
+
+	require.NoError(t, err)
+	assert.Len(t, results, 2)
+	assert.Equal(t, int64(1), results[0]["id"])
+	assert.Equal(t, "John Doe", results[0]["name"])
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestPgSQLInsertQuery_Exec tests insert query execution
+func TestPgSQLInsertQuery_Exec(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	mock.ExpectExec("INSERT INTO users").
+		WithArgs("John Doe", "john@example.com", 25).
+		WillReturnResult(sqlmock.NewResult(1, 1))
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	result, err := adapter.NewInsert().
+		Table("users").
+		Value("name", "John Doe").
+		Value("email", "john@example.com").
+		Value("age", 25).
+		Exec(ctx)
+
+	require.NoError(t, err)
+	assert.NotNil(t, result)
+	assert.Equal(t, int64(1), result.RowsAffected())
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestPgSQLUpdateQuery_Exec tests update query execution
+func TestPgSQLUpdateQuery_Exec(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	// Note: Args order is SET values first, then WHERE values
+	mock.ExpectExec("UPDATE users SET name = \\$1 WHERE id = \\$2").
+		WithArgs("Jane Doe", 1).
+		WillReturnResult(sqlmock.NewResult(0, 1))
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	result, err := adapter.NewUpdate().
+		Table("users").
+		Set("name", "Jane Doe").
+		Where("id = ?", 1).
+		Exec(ctx)
+
+	require.NoError(t, err)
+	assert.NotNil(t, result)
+	assert.Equal(t, int64(1), result.RowsAffected())
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestPgSQLDeleteQuery_Exec tests delete query execution
+func TestPgSQLDeleteQuery_Exec(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	mock.ExpectExec("DELETE FROM users WHERE id = \\$1").
+		WithArgs(1).
+		WillReturnResult(sqlmock.NewResult(0, 1))
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	result, err := adapter.NewDelete().
+		Table("users").
+		Where("id = ?", 1).
+		Exec(ctx)
+
+	require.NoError(t, err)
+	assert.NotNil(t, result)
+	assert.Equal(t, int64(1), result.RowsAffected())
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestPgSQLSelectQuery_Count tests count query
+func TestPgSQLSelectQuery_Count(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	rows := sqlmock.NewRows([]string{"count"}).AddRow(42)
+	mock.ExpectQuery("SELECT COUNT\\(\\*\\) FROM users").WillReturnRows(rows)
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	count, err := adapter.NewSelect().
+		Table("users").
+		Count(ctx)
+
+	require.NoError(t, err)
+	assert.Equal(t, 42, count)
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestPgSQLSelectQuery_Exists tests exists query
+func TestPgSQLSelectQuery_Exists(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	rows := sqlmock.NewRows([]string{"count"}).AddRow(1)
+	mock.ExpectQuery("SELECT COUNT\\(\\*\\) FROM users").WillReturnRows(rows)
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	exists, err := adapter.NewSelect().
+		Table("users").
+		Where("email = ?", "john@example.com").
+		Exists(ctx)
+
+	require.NoError(t, err)
+	assert.True(t, exists)
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestPgSQLAdapter_Transaction tests transaction handling
+func TestPgSQLAdapter_Transaction(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	mock.ExpectBegin()
+	mock.ExpectExec("INSERT INTO users").WillReturnResult(sqlmock.NewResult(1, 1))
+	mock.ExpectCommit()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	err = adapter.RunInTransaction(ctx, func(tx common.Database) error {
+		_, err := tx.NewInsert().
+			Table("users").
+			Value("name", "John").
+			Exec(ctx)
+		return err
+	})
+
+	require.NoError(t, err)
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestPgSQLAdapter_TransactionRollback tests transaction rollback
+func TestPgSQLAdapter_TransactionRollback(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	mock.ExpectBegin()
+	mock.ExpectExec("INSERT INTO users").WillReturnError(sql.ErrConnDone)
+	mock.ExpectRollback()
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	err = adapter.RunInTransaction(ctx, func(tx common.Database) error {
+		_, err := tx.NewInsert().
+			Table("users").
+			Value("name", "John").
+			Exec(ctx)
+		return err
+	})
+
+	assert.Error(t, err)
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestBuildFieldMap tests field mapping construction
+func TestBuildFieldMap(t *testing.T) {
+	userType := reflect.TypeOf(TestUser{})
+	fieldMap := buildFieldMap(userType, nil)
+
+	assert.NotEmpty(t, fieldMap)
+
+	// Check that fields are mapped
+	assert.Contains(t, fieldMap, "id")
+	assert.Contains(t, fieldMap, "name")
+	assert.Contains(t, fieldMap, "email")
+	assert.Contains(t, fieldMap, "age")
+
+	// Check field info
+	idInfo := fieldMap["id"]
+	assert.Equal(t, "ID", idInfo.Name)
+}
+
+// TestGetRelationMetadata tests relationship metadata extraction
+func TestGetRelationMetadata(t *testing.T) {
+	q := &PgSQLSelectQuery{
+		model: &TestPost{},
+	}
+
+	// Test belongs-to relationship
+	meta := q.getRelationMetadata("User")
+	assert.NotNil(t, meta)
+	assert.Equal(t, "User", meta.fieldName)
+
+	// Test has-many relationship
+	meta = q.getRelationMetadata("Comments")
+	assert.NotNil(t, meta)
+	assert.Equal(t, "Comments", meta.fieldName)
+}
+
+// TestPreloadConfiguration tests preload configuration
+func TestPreloadConfiguration(t *testing.T) {
+	db, _, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	adapter := NewPgSQLAdapter(db)
+
+	// Test Preload
+	query := adapter.NewSelect().
+		Model(&TestPost{}).
+		Table("posts").
+		Preload("User")
+
+	pgQuery := query.(*PgSQLSelectQuery)
+	assert.Len(t, pgQuery.preloads, 1)
+	assert.Equal(t, "User", pgQuery.preloads[0].relation)
+	assert.False(t, pgQuery.preloads[0].useJoin)
+
+	// Test PreloadRelation
+	query = adapter.NewSelect().
+		Model(&TestPost{}).
+		Table("posts").
+		PreloadRelation("Comments")
+
+	pgQuery = query.(*PgSQLSelectQuery)
+	assert.Len(t, pgQuery.preloads, 1)
+	assert.Equal(t, "Comments", pgQuery.preloads[0].relation)
+
+	// Test JoinRelation
+	query = adapter.NewSelect().
+		Model(&TestPost{}).
+		Table("posts").
+		JoinRelation("User")
+
+	pgQuery = query.(*PgSQLSelectQuery)
+	assert.Len(t, pgQuery.preloads, 1)
+	assert.Equal(t, "User", pgQuery.preloads[0].relation)
+	assert.True(t, pgQuery.preloads[0].useJoin)
+}
+
+// TestScanModel tests ScanModel functionality
+func TestScanModel(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	rows := sqlmock.NewRows([]string{"id", "name", "email", "age"}).
+		AddRow(1, "John Doe", "john@example.com", 25)
+
+	mock.ExpectQuery("SELECT (.+) FROM users").WillReturnRows(rows)
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	user := &TestUser{}
+	err = adapter.NewSelect().
+		Model(user).
+		Table("users").
+		Where("id = ?", 1).
+		ScanModel(ctx)
+
+	require.NoError(t, err)
+	assert.Equal(t, 1, user.ID)
+	assert.Equal(t, "John Doe", user.Name)
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}
+
+// TestRawSQL tests raw SQL execution
+func TestRawSQL(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	require.NoError(t, err)
+	defer db.Close()
+
+	// Test Exec
+	mock.ExpectExec("CREATE TABLE test").WillReturnResult(sqlmock.NewResult(0, 0))
+
+	adapter := NewPgSQLAdapter(db)
+	ctx := context.Background()
+
+	_, err = adapter.Exec(ctx, "CREATE TABLE test (id INT)")
+	require.NoError(t, err)
+
+	// Test Query
+	rows := sqlmock.NewRows([]string{"id", "name"}).AddRow(1, "Test")
+	mock.ExpectQuery("SELECT (.+) FROM test").WillReturnRows(rows)
+
+	var results []map[string]interface{}
+	err = adapter.Query(ctx, &results, "SELECT * FROM test WHERE id = $1", 1)
+	require.NoError(t, err)
+	assert.Len(t, results, 1)
+
+	assert.NoError(t, mock.ExpectationsWereMet())
+}

pkg/common/adapters/database/test_helpers.go

@@ -0,0 +1,132 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestHelper provides utilities for database testing
+type TestHelper struct {
+	DB      *sql.DB
+	Adapter *PgSQLAdapter
+	t       *testing.T
+}
+
+// NewTestHelper creates a new test helper
+func NewTestHelper(t *testing.T, db *sql.DB) *TestHelper {
+	return &TestHelper{
+		DB:      db,
+		Adapter: NewPgSQLAdapter(db),
+		t:       t,
+	}
+}
+
+// CleanupTables truncates all test tables
+func (h *TestHelper) CleanupTables() {
+	ctx := context.Background()
+	tables := []string{"comments", "posts", "users"}
+
+	for _, table := range tables {
+		_, err := h.DB.ExecContext(ctx, "TRUNCATE TABLE "+table+" CASCADE")
+		require.NoError(h.t, err)
+	}
+}
+
+// InsertUser inserts a test user and returns the ID
+func (h *TestHelper) InsertUser(name, email string, age int) int {
+	ctx := context.Background()
+	result, err := h.Adapter.NewInsert().
+		Table("users").
+		Value("name", name).
+		Value("email", email).
+		Value("age", age).
+		Exec(ctx)
+
+	require.NoError(h.t, err)
+	id, _ := result.LastInsertId()
+	return int(id)
+}
+
+// InsertPost inserts a test post and returns the ID
+func (h *TestHelper) InsertPost(userID int, title, content string, published bool) int {
+	ctx := context.Background()
+	result, err := h.Adapter.NewInsert().
+		Table("posts").
+		Value("user_id", userID).
+		Value("title", title).
+		Value("content", content).
+		Value("published", published).
+		Exec(ctx)
+
+	require.NoError(h.t, err)
+	id, _ := result.LastInsertId()
+	return int(id)
+}
+
+// InsertComment inserts a test comment and returns the ID
+func (h *TestHelper) InsertComment(postID int, content string) int {
+	ctx := context.Background()
+	result, err := h.Adapter.NewInsert().
+		Table("comments").
+		Value("post_id", postID).
+		Value("content", content).
+		Exec(ctx)
+
+	require.NoError(h.t, err)
+	id, _ := result.LastInsertId()
+	return int(id)
+}
+
+// AssertUserExists checks if a user exists by email
+func (h *TestHelper) AssertUserExists(email string) {
+	ctx := context.Background()
+	exists, err := h.Adapter.NewSelect().
+		Table("users").
+		Where("email = ?", email).
+		Exists(ctx)
+
+	require.NoError(h.t, err)
+	require.True(h.t, exists, "User with email %s should exist", email)
+}
+
+// AssertUserCount asserts the number of users
+func (h *TestHelper) AssertUserCount(expected int) {
+	ctx := context.Background()
+	count, err := h.Adapter.NewSelect().
+		Table("users").
+		Count(ctx)
+
+	require.NoError(h.t, err)
+	require.Equal(h.t, expected, count)
+}
+
+// GetUserByEmail retrieves a user by email
+func (h *TestHelper) GetUserByEmail(email string) map[string]interface{} {
+	ctx := context.Background()
+	var results []map[string]interface{}
+	err := h.Adapter.NewSelect().
+		Table("users").
+		Where("email = ?", email).
+		Scan(ctx, &results)
+
+	require.NoError(h.t, err)
+	require.Len(h.t, results, 1, "Expected exactly one user with email %s", email)
+	return results[0]
+}
+
+// BeginTestTransaction starts a transaction for testing
+func (h *TestHelper) BeginTestTransaction() (*PgSQLTxAdapter, func()) {
+	ctx := context.Background()
+	tx, err := h.DB.BeginTx(ctx, nil)
+	require.NoError(h.t, err)
+
+	adapter := &PgSQLTxAdapter{tx: tx}
+	cleanup := func() {
+		tx.Rollback()
+	}
+
+	return adapter, cleanup
+}

pkg/common/interfaces.go

@@ -24,6 +24,12 @@ type Database interface {
 	CommitTx(ctx context.Context) error
 	RollbackTx(ctx context.Context) error
 	RunInTransaction(ctx context.Context, fn func(Database) error) error
+
+	// GetUnderlyingDB returns the underlying database connection
+	// For GORM, this returns *gorm.DB
+	// For Bun, this returns *bun.DB
+	// This is useful for provider-specific features like PostgreSQL NOTIFY/LISTEN
+	GetUnderlyingDB() interface{}
 }
 
 // SelectQuery interface for building SELECT queries (compatible with both GORM and Bun)

pkg/common/sql_helpers.go

@@ -2,6 +2,7 @@ package common
 
 import (
 	"fmt"
+	"regexp"
 	"strings"
 
 	"github.com/bitechdev/ResolveSpec/pkg/logger"
@@ -207,6 +208,20 @@ func SanitizeWhereClause(where string, tableName string, options ...*RequestOpti
 					}
 				}
 			}
+		} else if tableName != "" && !hasTablePrefix(condToCheck) {
+			// If tableName is provided and the condition DOESN'T have a table prefix,
+			// qualify unambiguous column references to prevent "ambiguous column" errors
+			// when there are multiple joins on the same table (e.g., recursive preloads)
+			columnName := extractUnqualifiedColumnName(condToCheck)
+			if columnName != "" && (validColumns == nil || isValidColumn(columnName, validColumns)) {
+				// Qualify the column with the table name
+				// Be careful to only replace the column name, not other occurrences of the string
+				oldRef := columnName
+				newRef := tableName + "." + columnName
+				// Use word boundary matching to avoid replacing partial matches
+				cond = qualifyColumnInCondition(cond, oldRef, newRef)
+				logger.Debug("Qualified unqualified column in condition: '%s' added table prefix '%s'", oldRef, tableName)
+			}
 		}
 
 		validConditions = append(validConditions, cond)
@@ -483,6 +498,86 @@ func extractTableAndColumn(cond string) (table string, column string) {
 	return "", ""
 }
 
+// extractUnqualifiedColumnName extracts the column name from an unqualified condition
+// For example: "rid_parentmastertaskitem is null" returns "rid_parentmastertaskitem"
+// "status = 'active'" returns "status"
+func extractUnqualifiedColumnName(cond string) string {
+	// Common SQL operators
+	operators := []string{" = ", " != ", " <> ", " > ", " >= ", " < ", " <= ", " LIKE ", " like ", " IN ", " in ", " IS ", " is ", " NOT ", " not "}
+
+	// Find the column reference (left side of the operator)
+	minIdx := -1
+	for _, op := range operators {
+		idx := strings.Index(cond, op)
+		if idx > 0 && (minIdx == -1 || idx < minIdx) {
+			minIdx = idx
+		}
+	}
+
+	var columnRef string
+	if minIdx > 0 {
+		columnRef = strings.TrimSpace(cond[:minIdx])
+	} else {
+		// No operator found, might be a single column reference
+		parts := strings.Fields(cond)
+		if len(parts) > 0 {
+			columnRef = parts[0]
+		}
+	}
+
+	if columnRef == "" {
+		return ""
+	}
+
+	// Remove any quotes
+	columnRef = strings.Trim(columnRef, "`\"'")
+
+	// Return empty if it contains a dot (already qualified) or function call
+	if strings.Contains(columnRef, ".") || strings.Contains(columnRef, "(") {
+		return ""
+	}
+
+	return columnRef
+}
+
+// qualifyColumnInCondition replaces an unqualified column name with a qualified one in a condition
+// Uses word boundaries to avoid partial matches
+// For example: qualifyColumnInCondition("rid_item is null", "rid_item", "table.rid_item")
+// returns "table.rid_item is null"
+func qualifyColumnInCondition(cond, oldRef, newRef string) string {
+	// Use word boundary matching with Go's supported regex syntax
+	// \b matches word boundaries
+	escapedOld := regexp.QuoteMeta(oldRef)
+	pattern := `\b` + escapedOld + `\b`
+
+	re, err := regexp.Compile(pattern)
+	if err != nil {
+		// If regex fails, fall back to simple string replacement
+		logger.Debug("Failed to compile regex for column qualification, using simple replace: %v", err)
+		return strings.Replace(cond, oldRef, newRef, 1)
+	}
+
+	// Only replace if the match is not preceded by a dot (to avoid replacing already qualified columns)
+	result := cond
+	matches := re.FindAllStringIndex(cond, -1)
+
+	// Process matches in reverse order to maintain correct indices
+	for i := len(matches) - 1; i >= 0; i-- {
+		match := matches[i]
+		start := match[0]
+
+		// Check if preceded by a dot (already qualified)
+		if start > 0 && cond[start-1] == '.' {
+			continue
+		}
+
+		// Replace this occurrence
+		result = result[:start] + newRef + result[match[1]:]
+	}
+
+	return result
+}
+
 // findOperatorOutsideParentheses finds the first occurrence of an operator outside of parentheses
 // Returns the index of the operator, or -1 if not found or only found inside parentheses
 func findOperatorOutsideParentheses(s string, operator string) int {

pkg/common/sql_helpers_test.go

@@ -33,16 +33,16 @@ func TestSanitizeWhereClause(t *testing.T) {
 			expected:  "",
 		},
 		{
-			name:      "valid condition with parentheses - no prefix added",
+			name:      "valid condition with parentheses - prefix added to prevent ambiguity",
 			where:     "(status = 'active')",
 			tableName: "users",
-			expected:  "status = 'active'",
+			expected:  "users.status = 'active'",
 		},
 		{
-			name:      "mixed trivial and valid conditions - no prefix added",
+			name:      "mixed trivial and valid conditions - prefix added",
 			where:     "true AND status = 'active' AND 1=1",
 			tableName: "users",
-			expected:  "status = 'active'",
+			expected:  "users.status = 'active'",
 		},
 		{
 			name:      "condition with correct table prefix - unchanged",
@@ -63,10 +63,10 @@ func TestSanitizeWhereClause(t *testing.T) {
 			expected:  "users.status = 'active' AND users.age > 18",
 		},
 		{
-			name:      "multiple valid conditions without prefix - no prefix added",
+			name:      "multiple valid conditions without prefix - prefixes added",
 			where:     "status = 'active' AND age > 18",
 			tableName: "users",
-			expected:  "status = 'active' AND age > 18",
+			expected:  "users.status = 'active' AND users.age > 18",
 		},
 		{
 			name:      "no table name provided",
@@ -90,13 +90,13 @@ func TestSanitizeWhereClause(t *testing.T) {
 			name:      "mixed case AND operators",
 			where:     "status = 'active' AND age > 18 and name = 'John'",
 			tableName: "users",
-			expected:  "status = 'active' AND age > 18 AND name = 'John'",
+			expected:  "users.status = 'active' AND users.age > 18 AND users.name = 'John'",
 		},
 		{
 			name:      "subquery with ORDER BY and LIMIT - allowed",
 			where:     "id IN (SELECT id FROM users WHERE status = 'active' ORDER BY created_at DESC LIMIT 10)",
 			tableName: "users",
-			expected:  "id IN (SELECT id FROM users WHERE status = 'active' ORDER BY created_at DESC LIMIT 10)",
+			expected:  "users.id IN (SELECT users.id FROM users WHERE status = 'active' ORDER BY created_at DESC LIMIT 10)",
 		},
 		{
 			name:      "dangerous DELETE keyword - blocked",

pkg/config/config.go

@@ -12,6 +12,7 @@ type Config struct {
 	Middleware    MiddlewareConfig    `mapstructure:"middleware"`
 	CORS          CORSConfig          `mapstructure:"cors"`
 	Database      DatabaseConfig      `mapstructure:"database"`
+	EventBroker   EventBrokerConfig   `mapstructure:"event_broker"`
 }
 
 // ServerConfig holds server-related configuration
@@ -91,3 +92,52 @@ type ErrorTrackingConfig struct {
 	SampleRate       float64 `mapstructure:"sample_rate"`        // Error sample rate (0.0-1.0)
 	TracesSampleRate float64 `mapstructure:"traces_sample_rate"` // Traces sample rate (0.0-1.0)
 }
+
+// EventBrokerConfig contains configuration for the event broker
+type EventBrokerConfig struct {
+	Enabled     bool                         `mapstructure:"enabled"`
+	Provider    string                       `mapstructure:"provider"` // memory, redis, nats, database
+	Mode        string                       `mapstructure:"mode"`     // sync, async
+	WorkerCount int                          `mapstructure:"worker_count"`
+	BufferSize  int                          `mapstructure:"buffer_size"`
+	InstanceID  string                       `mapstructure:"instance_id"`
+	Redis       EventBrokerRedisConfig       `mapstructure:"redis"`
+	NATS        EventBrokerNATSConfig        `mapstructure:"nats"`
+	Database    EventBrokerDatabaseConfig    `mapstructure:"database"`
+	RetryPolicy EventBrokerRetryPolicyConfig `mapstructure:"retry_policy"`
+}
+
+// EventBrokerRedisConfig contains Redis-specific configuration
+type EventBrokerRedisConfig struct {
+	StreamName    string `mapstructure:"stream_name"`
+	ConsumerGroup string `mapstructure:"consumer_group"`
+	MaxLen        int64  `mapstructure:"max_len"`
+	Host          string `mapstructure:"host"`
+	Port          int    `mapstructure:"port"`
+	Password      string `mapstructure:"password"`
+	DB            int    `mapstructure:"db"`
+}
+
+// EventBrokerNATSConfig contains NATS-specific configuration
+type EventBrokerNATSConfig struct {
+	URL        string        `mapstructure:"url"`
+	StreamName string        `mapstructure:"stream_name"`
+	Subjects   []string      `mapstructure:"subjects"`
+	Storage    string        `mapstructure:"storage"` // file, memory
+	MaxAge     time.Duration `mapstructure:"max_age"`
+}
+
+// EventBrokerDatabaseConfig contains database provider configuration
+type EventBrokerDatabaseConfig struct {
+	TableName    string        `mapstructure:"table_name"`
+	Channel      string        `mapstructure:"channel"` // PostgreSQL NOTIFY channel name
+	PollInterval time.Duration `mapstructure:"poll_interval"`
+}
+
+// EventBrokerRetryPolicyConfig contains retry policy configuration
+type EventBrokerRetryPolicyConfig struct {
+	MaxRetries    int           `mapstructure:"max_retries"`
+	InitialDelay  time.Duration `mapstructure:"initial_delay"`
+	MaxDelay      time.Duration `mapstructure:"max_delay"`
+	BackoffFactor float64       `mapstructure:"backoff_factor"`
+}

pkg/config/manager.go

@@ -165,4 +165,39 @@ func setDefaults(v *viper.Viper) {
 
 	// Database defaults
 	v.SetDefault("database.url", "")
+
+	// Event Broker defaults
+	v.SetDefault("event_broker.enabled", false)
+	v.SetDefault("event_broker.provider", "memory")
+	v.SetDefault("event_broker.mode", "async")
+	v.SetDefault("event_broker.worker_count", 10)
+	v.SetDefault("event_broker.buffer_size", 1000)
+	v.SetDefault("event_broker.instance_id", "")
+
+	// Event Broker - Redis defaults
+	v.SetDefault("event_broker.redis.stream_name", "resolvespec:events")
+	v.SetDefault("event_broker.redis.consumer_group", "resolvespec-workers")
+	v.SetDefault("event_broker.redis.max_len", 10000)
+	v.SetDefault("event_broker.redis.host", "localhost")
+	v.SetDefault("event_broker.redis.port", 6379)
+	v.SetDefault("event_broker.redis.password", "")
+	v.SetDefault("event_broker.redis.db", 0)
+
+	// Event Broker - NATS defaults
+	v.SetDefault("event_broker.nats.url", "nats://localhost:4222")
+	v.SetDefault("event_broker.nats.stream_name", "RESOLVESPEC_EVENTS")
+	v.SetDefault("event_broker.nats.subjects", []string{"events.>"})
+	v.SetDefault("event_broker.nats.storage", "file")
+	v.SetDefault("event_broker.nats.max_age", "24h")
+
+	// Event Broker - Database defaults
+	v.SetDefault("event_broker.database.table_name", "events")
+	v.SetDefault("event_broker.database.channel", "resolvespec_events")
+	v.SetDefault("event_broker.database.poll_interval", "1s")
+
+	// Event Broker - Retry Policy defaults
+	v.SetDefault("event_broker.retry_policy.max_retries", 3)
+	v.SetDefault("event_broker.retry_policy.initial_delay", "1s")
+	v.SetDefault("event_broker.retry_policy.max_delay", "30s")
+	v.SetDefault("event_broker.retry_policy.backoff_factor", 2.0)
 }

pkg/eventbroker/README.md

@@ -0,0 +1,327 @@
+# Event Broker System
+
+A comprehensive event handler/broker system for ResolveSpec that provides real-time event publishing, subscription, and cross-instance communication.
+
+## Features
+
+- **Multiple Sources**: Events from database, websockets, frontend, system, and internal sources
+- **Event Status Tracking**: Pending, processing, completed, failed states with timestamps
+- **Rich Metadata**: User IDs, session IDs, instance IDs, JSON payloads, and custom metadata
+- **Sync & Async Modes**: Choose between synchronous or asynchronous event processing
+- **Pattern Matching**: Subscribe to events using glob-style patterns
+- **Multiple Providers**: In-memory, Redis Streams, NATS JetStream, PostgreSQL with NOTIFY
+- **Hook Integration**: Automatic CRUD event capture via restheadspec hooks
+- **Retry Logic**: Configurable retry policy with exponential backoff
+- **Metrics**: Prometheus-compatible metrics for monitoring
+- **Graceful Shutdown**: Proper cleanup and event flushing on shutdown
+
+## Quick Start
+
+### 1. Configuration
+
+Add to your `config.yaml`:
+
+```yaml
+event_broker:
+  enabled: true
+  provider: memory  # memory, redis, nats, database
+  mode: async       # sync, async
+  worker_count: 10
+  buffer_size: 1000
+  instance_id: "${HOSTNAME}"
+```
+
+### 2. Initialize
+
+```go
+import (
+	"github.com/bitechdev/ResolveSpec/pkg/config"
+	"github.com/bitechdev/ResolveSpec/pkg/eventbroker"
+)
+
+func main() {
+	// Load configuration
+	cfgMgr := config.NewManager()
+	cfg, _ := cfgMgr.GetConfig()
+
+	// Initialize event broker
+	if err := eventbroker.Initialize(cfg.EventBroker); err != nil {
+		log.Fatal(err)
+	}
+}
+```
+
+### 3. Subscribe to Events
+
+```go
+// Subscribe to specific events
+eventbroker.Subscribe("public.users.create", eventbroker.EventHandlerFunc(
+	func(ctx context.Context, event *eventbroker.Event) error {
+		log.Printf("New user created: %s", event.Payload)
+		// Send welcome email, update cache, etc.
+		return nil
+	},
+))
+
+// Subscribe with patterns
+eventbroker.Subscribe("*.*.delete", eventbroker.EventHandlerFunc(
+	func(ctx context.Context, event *eventbroker.Event) error {
+		log.Printf("Deleted: %s.%s", event.Schema, event.Entity)
+		return nil
+	},
+))
+```
+
+### 4. Publish Events
+
+```go
+// Create and publish an event
+event := eventbroker.NewEvent(eventbroker.EventSourceDatabase, "public.users.update")
+event.InstanceID = eventbroker.GetDefaultBroker().InstanceID()
+event.UserID = 123
+event.SessionID = "session-456"
+event.Schema = "public"
+event.Entity = "users"
+event.Operation = "update"
+
+event.SetPayload(map[string]interface{}{
+	"id": 123,
+	"name": "John Doe",
+})
+
+// Async (non-blocking)
+eventbroker.PublishAsync(ctx, event)
+
+// Sync (blocking)
+eventbroker.PublishSync(ctx, event)
+```
+
+## Automatic CRUD Event Capture
+
+Automatically capture database CRUD operations:
+
+```go
+import (
+	"github.com/bitechdev/ResolveSpec/pkg/eventbroker"
+	"github.com/bitechdev/ResolveSpec/pkg/restheadspec"
+)
+
+func setupHooks(handler *restheadspec.Handler) {
+	broker := eventbroker.GetDefaultBroker()
+
+	// Configure which operations to capture
+	config := eventbroker.DefaultCRUDHookConfig()
+	config.EnableRead = false // Disable read events for performance
+
+	// Register hooks
+	eventbroker.RegisterCRUDHooks(broker, handler.Hooks(), config)
+
+	// Now all create/update/delete operations automatically publish events!
+}
+```
+
+## Event Structure
+
+Every event contains:
+
+```go
+type Event struct {
+	ID          string                 // UUID
+	Source      EventSource            // database, websocket, system, frontend, internal
+	Type        string                 // Pattern: schema.entity.operation
+	Status      EventStatus            // pending, processing, completed, failed
+	Payload     json.RawMessage        // JSON payload
+	UserID      int                    // User who triggered the event
+	SessionID   string                 // Session identifier
+	InstanceID  string                 // Server instance identifier
+	Schema      string                 // Database schema
+	Entity      string                 // Database entity/table
+	Operation   string                 // create, update, delete, read
+	CreatedAt   time.Time              // When event was created
+	ProcessedAt *time.Time             // When processing started
+	CompletedAt *time.Time             // When processing completed
+	Error       string                 // Error message if failed
+	Metadata    map[string]interface{} // Additional context
+	RetryCount  int                    // Number of retry attempts
+}
+```
+
+## Pattern Matching
+
+Subscribe to events using glob-style patterns:
+
+| Pattern | Matches | Example |
+|---------|---------|---------|
+| `*` | All events | Any event |
+| `public.users.*` | All user operations | `public.users.create`, `public.users.update` |
+| `*.*.create` | All create operations | `public.users.create`, `auth.sessions.create` |
+| `public.*.*` | All events in public schema | `public.users.create`, `public.posts.delete` |
+| `public.users.create` | Exact match | Only `public.users.create` |
+
+## Providers
+
+### Memory Provider (Default)
+
+Best for: Development, single-instance deployments
+
+- **Pros**: Fast, no dependencies, simple
+- **Cons**: Events lost on restart, single-instance only
+
+```yaml
+event_broker:
+  provider: memory
+```
+
+### Redis Provider (Future)
+
+Best for: Production, multi-instance deployments
+
+- **Pros**: Persistent, cross-instance pub/sub, reliable
+- **Cons**: Requires Redis
+
+```yaml
+event_broker:
+  provider: redis
+  redis:
+    stream_name: "resolvespec:events"
+    consumer_group: "resolvespec-workers"
+    host: "localhost"
+    port: 6379
+```
+
+### NATS Provider (Future)
+
+Best for: High-performance, low-latency requirements
+
+- **Pros**: Very fast, built-in clustering, durable
+- **Cons**: Requires NATS server
+
+```yaml
+event_broker:
+  provider: nats
+  nats:
+    url: "nats://localhost:4222"
+    stream_name: "RESOLVESPEC_EVENTS"
+```
+
+### Database Provider (Future)
+
+Best for: Audit trails, event replay, SQL queries
+
+- **Pros**: No additional infrastructure, full SQL query support, PostgreSQL NOTIFY for real-time
+- **Cons**: Slower than Redis/NATS
+
+```yaml
+event_broker:
+  provider: database
+  database:
+    table_name: "events"
+    channel: "resolvespec_events"
+```
+
+## Processing Modes
+
+### Async Mode (Recommended)
+
+Events are queued and processed by worker pool:
+
+- Non-blocking event publishing
+- Configurable worker count
+- Better throughput
+- Events may be processed out of order
+
+```yaml
+event_broker:
+  mode: async
+  worker_count: 10
+  buffer_size: 1000
+```
+
+### Sync Mode
+
+Events are processed immediately:
+
+- Blocking event publishing
+- Guaranteed ordering
+- Immediate error feedback
+- Lower throughput
+
+```yaml
+event_broker:
+  mode: sync
+```
+
+## Retry Policy
+
+Configure automatic retries for failed handlers:
+
+```yaml
+event_broker:
+  retry_policy:
+    max_retries: 3
+    initial_delay: 1s
+    max_delay: 30s
+    backoff_factor: 2.0  # Exponential backoff
+```
+
+## Metrics
+
+The event broker exposes Prometheus metrics:
+
+- `eventbroker_events_published_total{source, type}` - Total events published
+- `eventbroker_events_processed_total{source, type, status}` - Total events processed
+- `eventbroker_event_processing_duration_seconds{source, type}` - Event processing duration
+- `eventbroker_queue_size` - Current queue size (async mode)
+
+## Best Practices
+
+1. **Use Async Mode**: For better performance, use async mode in production
+2. **Disable Read Events**: Read events can be high volume; disable if not needed
+3. **Pattern Matching**: Use specific patterns to avoid processing unnecessary events
+4. **Error Handling**: Always handle errors in event handlers; they won't fail the original operation
+5. **Idempotency**: Make handlers idempotent as events may be retried
+6. **Payload Size**: Keep payloads reasonable; avoid large objects
+7. **Monitoring**: Monitor metrics to detect issues early
+
+## Examples
+
+See `example_usage.go` for comprehensive examples including:
+- Basic event publishing and subscription
+- Hook integration
+- Error handling
+- Configuration
+- Pattern matching
+
+## Architecture
+
+```
+┌─────────────────┐
+│   Application   │
+└────────┬────────┘
+         │
+         ├─ Publish Events
+         │
+┌────────▼────────┐      ┌──────────────┐
+│  Event Broker   │◄────►│  Subscribers │
+└────────┬────────┘      └──────────────┘
+         │
+         ├─ Store Events
+         │
+┌────────▼────────┐
+│    Provider     │
+│  (Memory/Redis  │
+│   /NATS/DB)     │
+└─────────────────┘
+```
+
+## Future Enhancements
+
+- [ ] Database Provider with PostgreSQL NOTIFY
+- [ ] Redis Streams Provider
+- [ ] NATS JetStream Provider
+- [ ] Event replay functionality
+- [ ] Dead letter queue
+- [ ] Event filtering at provider level
+- [ ] Batch publishing
+- [ ] Event compression
+- [ ] Schema versioning

pkg/eventbroker/broker.go

@@ -0,0 +1,453 @@
+package eventbroker
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
+)
+
+// Broker is the main interface for event publishing and subscription
+type Broker interface {
+	// Publish publishes an event (mode-dependent: sync or async)
+	Publish(ctx context.Context, event *Event) error
+
+	// PublishSync publishes an event synchronously (blocks until all handlers complete)
+	PublishSync(ctx context.Context, event *Event) error
+
+	// PublishAsync publishes an event asynchronously (returns immediately)
+	PublishAsync(ctx context.Context, event *Event) error
+
+	// Subscribe registers a handler for events matching the pattern
+	Subscribe(pattern string, handler EventHandler) (SubscriptionID, error)
+
+	// Unsubscribe removes a subscription
+	Unsubscribe(id SubscriptionID) error
+
+	// Start starts the broker (begins processing events)
+	Start(ctx context.Context) error
+
+	// Stop stops the broker gracefully (flushes pending events)
+	Stop(ctx context.Context) error
+
+	// Stats returns broker statistics
+	Stats(ctx context.Context) (*BrokerStats, error)
+
+	// InstanceID returns the instance ID of this broker
+	InstanceID() string
+}
+
+// ProcessingMode determines how events are processed
+type ProcessingMode string
+
+const (
+	ProcessingModeSync  ProcessingMode = "sync"
+	ProcessingModeAsync ProcessingMode = "async"
+)
+
+// BrokerStats contains broker statistics
+type BrokerStats struct {
+	InstanceID        string                 `json:"instance_id"`
+	Mode              ProcessingMode         `json:"mode"`
+	IsRunning         bool                   `json:"is_running"`
+	TotalPublished    int64                  `json:"total_published"`
+	TotalProcessed    int64                  `json:"total_processed"`
+	TotalFailed       int64                  `json:"total_failed"`
+	ActiveSubscribers int                    `json:"active_subscribers"`
+	QueueSize         int                    `json:"queue_size,omitempty"`     // For async mode
+	ActiveWorkers     int                    `json:"active_workers,omitempty"` // For async mode
+	ProviderStats     *ProviderStats         `json:"provider_stats,omitempty"`
+	AdditionalStats   map[string]interface{} `json:"additional_stats,omitempty"`
+}
+
+// EventBroker implements the Broker interface
+type EventBroker struct {
+	provider      Provider
+	subscriptions *subscriptionManager
+	mode          ProcessingMode
+	instanceID    string
+	retryPolicy   *RetryPolicy
+
+	// Async mode fields (initialized in Phase 4)
+	workerPool *workerPool
+
+	// Runtime state
+	isRunning atomic.Bool
+	stopOnce  sync.Once
+	stopCh    chan struct{}
+	wg        sync.WaitGroup
+
+	// Statistics
+	statsPublished atomic.Int64
+	statsProcessed atomic.Int64
+	statsFailed    atomic.Int64
+}
+
+// RetryPolicy defines how failed events should be retried
+type RetryPolicy struct {
+	MaxRetries    int
+	InitialDelay  time.Duration
+	MaxDelay      time.Duration
+	BackoffFactor float64
+}
+
+// DefaultRetryPolicy returns a sensible default retry policy
+func DefaultRetryPolicy() *RetryPolicy {
+	return &RetryPolicy{
+		MaxRetries:    3,
+		InitialDelay:  1 * time.Second,
+		MaxDelay:      30 * time.Second,
+		BackoffFactor: 2.0,
+	}
+}
+
+// Options for creating a new broker
+type Options struct {
+	Provider    Provider
+	Mode        ProcessingMode
+	WorkerCount int // For async mode
+	BufferSize  int // For async mode
+	RetryPolicy *RetryPolicy
+	InstanceID  string
+}
+
+// NewBroker creates a new event broker with the given options
+func NewBroker(opts Options) (*EventBroker, error) {
+	if opts.Provider == nil {
+		return nil, fmt.Errorf("provider is required")
+	}
+	if opts.InstanceID == "" {
+		return nil, fmt.Errorf("instance ID is required")
+	}
+	if opts.Mode == "" {
+		opts.Mode = ProcessingModeAsync // Default to async
+	}
+	if opts.RetryPolicy == nil {
+		opts.RetryPolicy = DefaultRetryPolicy()
+	}
+
+	broker := &EventBroker{
+		provider:      opts.Provider,
+		subscriptions: newSubscriptionManager(),
+		mode:          opts.Mode,
+		instanceID:    opts.InstanceID,
+		retryPolicy:   opts.RetryPolicy,
+		stopCh:        make(chan struct{}),
+	}
+
+	// Worker pool will be initialized in Phase 4 for async mode
+	if opts.Mode == ProcessingModeAsync {
+		if opts.WorkerCount == 0 {
+			opts.WorkerCount = 10 // Default
+		}
+		if opts.BufferSize == 0 {
+			opts.BufferSize = 1000 // Default
+		}
+		broker.workerPool = newWorkerPool(opts.WorkerCount, opts.BufferSize, broker.processEvent)
+	}
+
+	return broker, nil
+}
+
+// Functional option pattern helpers
+func WithProvider(p Provider) func(*Options) {
+	return func(o *Options) { o.Provider = p }
+}
+
+func WithMode(m ProcessingMode) func(*Options) {
+	return func(o *Options) { o.Mode = m }
+}
+
+func WithWorkerCount(count int) func(*Options) {
+	return func(o *Options) { o.WorkerCount = count }
+}
+
+func WithBufferSize(size int) func(*Options) {
+	return func(o *Options) { o.BufferSize = size }
+}
+
+func WithRetryPolicy(policy *RetryPolicy) func(*Options) {
+	return func(o *Options) { o.RetryPolicy = policy }
+}
+
+func WithInstanceID(id string) func(*Options) {
+	return func(o *Options) { o.InstanceID = id }
+}
+
+// Start starts the broker
+func (b *EventBroker) Start(ctx context.Context) error {
+	if b.isRunning.Load() {
+		return fmt.Errorf("broker already running")
+	}
+
+	b.isRunning.Store(true)
+
+	// Start worker pool for async mode
+	if b.mode == ProcessingModeAsync && b.workerPool != nil {
+		b.workerPool.Start()
+	}
+
+	logger.Info("Event broker started (mode: %s, instance: %s)", b.mode, b.instanceID)
+	return nil
+}
+
+// Stop stops the broker gracefully
+func (b *EventBroker) Stop(ctx context.Context) error {
+	var stopErr error
+
+	b.stopOnce.Do(func() {
+		logger.Info("Stopping event broker...")
+
+		// Mark as not running
+		b.isRunning.Store(false)
+
+		// Close the stop channel
+		close(b.stopCh)
+
+		// Stop worker pool for async mode
+		if b.mode == ProcessingModeAsync && b.workerPool != nil {
+			if err := b.workerPool.Stop(ctx); err != nil {
+				logger.Error("Error stopping worker pool: %v", err)
+				stopErr = err
+			}
+		}
+
+		// Wait for all goroutines
+		b.wg.Wait()
+
+		// Close provider
+		if err := b.provider.Close(); err != nil {
+			logger.Error("Error closing provider: %v", err)
+			if stopErr == nil {
+				stopErr = err
+			}
+		}
+
+		logger.Info("Event broker stopped")
+	})
+
+	return stopErr
+}
+
+// Publish publishes an event based on the broker's mode
+func (b *EventBroker) Publish(ctx context.Context, event *Event) error {
+	if b.mode == ProcessingModeSync {
+		return b.PublishSync(ctx, event)
+	}
+	return b.PublishAsync(ctx, event)
+}
+
+// PublishSync publishes an event synchronously
+func (b *EventBroker) PublishSync(ctx context.Context, event *Event) error {
+	if !b.isRunning.Load() {
+		return fmt.Errorf("broker is not running")
+	}
+
+	// Validate event
+	if err := event.Validate(); err != nil {
+		return fmt.Errorf("invalid event: %w", err)
+	}
+
+	// Store event in provider
+	if err := b.provider.Publish(ctx, event); err != nil {
+		return fmt.Errorf("failed to publish event: %w", err)
+	}
+
+	b.statsPublished.Add(1)
+
+	// Record metrics
+	recordEventPublished(event)
+
+	// Process event synchronously
+	if err := b.processEvent(ctx, event); err != nil {
+		logger.Error("Failed to process event %s: %v", event.ID, err)
+		b.statsFailed.Add(1)
+		return err
+	}
+
+	b.statsProcessed.Add(1)
+	return nil
+}
+
+// PublishAsync publishes an event asynchronously
+func (b *EventBroker) PublishAsync(ctx context.Context, event *Event) error {
+	if !b.isRunning.Load() {
+		return fmt.Errorf("broker is not running")
+	}
+
+	// Validate event
+	if err := event.Validate(); err != nil {
+		return fmt.Errorf("invalid event: %w", err)
+	}
+
+	// Store event in provider
+	if err := b.provider.Publish(ctx, event); err != nil {
+		return fmt.Errorf("failed to publish event: %w", err)
+	}
+
+	b.statsPublished.Add(1)
+
+	// Record metrics
+	recordEventPublished(event)
+
+	// Queue for async processing
+	if b.mode == ProcessingModeAsync && b.workerPool != nil {
+		// Update queue size metrics
+		updateQueueSize(int64(b.workerPool.QueueSize()))
+		return b.workerPool.Submit(ctx, event)
+	}
+
+	// Fallback to sync if async not configured
+	return b.processEvent(ctx, event)
+}
+
+// Subscribe adds a subscription for events matching the pattern
+func (b *EventBroker) Subscribe(pattern string, handler EventHandler) (SubscriptionID, error) {
+	return b.subscriptions.Subscribe(pattern, handler)
+}
+
+// Unsubscribe removes a subscription
+func (b *EventBroker) Unsubscribe(id SubscriptionID) error {
+	return b.subscriptions.Unsubscribe(id)
+}
+
+// processEvent processes an event by calling all matching handlers
+func (b *EventBroker) processEvent(ctx context.Context, event *Event) error {
+	startTime := time.Now()
+
+	// Get all handlers matching this event type
+	handlers := b.subscriptions.GetMatching(event.Type)
+
+	if len(handlers) == 0 {
+		logger.Debug("No handlers for event type: %s", event.Type)
+		return nil
+	}
+
+	logger.Debug("Processing event %s with %d handler(s)", event.ID, len(handlers))
+
+	// Mark event as processing
+	event.MarkProcessing()
+	if err := b.provider.UpdateStatus(ctx, event.ID, EventStatusProcessing, ""); err != nil {
+		logger.Warn("Failed to update event status: %v", err)
+	}
+
+	// Execute all handlers
+	var lastErr error
+	for i, handler := range handlers {
+		if err := b.executeHandlerWithRetry(ctx, handler, event); err != nil {
+			logger.Error("Handler %d failed for event %s: %v", i+1, event.ID, err)
+			lastErr = err
+			// Continue processing other handlers
+		}
+	}
+
+	// Update final status
+	if lastErr != nil {
+		event.MarkFailed(lastErr)
+		if err := b.provider.UpdateStatus(ctx, event.ID, EventStatusFailed, lastErr.Error()); err != nil {
+			logger.Warn("Failed to update event status: %v", err)
+		}
+
+		// Record metrics
+		recordEventProcessed(event, time.Since(startTime))
+
+		return lastErr
+	}
+
+	event.MarkCompleted()
+	if err := b.provider.UpdateStatus(ctx, event.ID, EventStatusCompleted, ""); err != nil {
+		logger.Warn("Failed to update event status: %v", err)
+	}
+
+	// Record metrics
+	recordEventProcessed(event, time.Since(startTime))
+
+	return nil
+}
+
+// executeHandlerWithRetry executes a handler with retry logic
+func (b *EventBroker) executeHandlerWithRetry(ctx context.Context, handler EventHandler, event *Event) error {
+	var lastErr error
+
+	for attempt := 0; attempt <= b.retryPolicy.MaxRetries; attempt++ {
+		if attempt > 0 {
+			// Calculate backoff delay
+			delay := b.calculateBackoff(attempt)
+			logger.Debug("Retrying event %s (attempt %d/%d) after %v",
+				event.ID, attempt, b.retryPolicy.MaxRetries, delay)
+
+			select {
+			case <-time.After(delay):
+			case <-ctx.Done():
+				return ctx.Err()
+			}
+
+			event.IncrementRetry()
+		}
+
+		// Execute handler
+		if err := handler.Handle(ctx, event); err != nil {
+			lastErr = err
+			logger.Warn("Handler failed for event %s (attempt %d): %v", event.ID, attempt+1, err)
+			continue
+		}
+
+		// Success
+		return nil
+	}
+
+	return fmt.Errorf("handler failed after %d attempts: %w", b.retryPolicy.MaxRetries+1, lastErr)
+}
+
+// calculateBackoff calculates the backoff delay for a retry attempt
+func (b *EventBroker) calculateBackoff(attempt int) time.Duration {
+	delay := float64(b.retryPolicy.InitialDelay) * pow(b.retryPolicy.BackoffFactor, float64(attempt-1))
+	if delay > float64(b.retryPolicy.MaxDelay) {
+		delay = float64(b.retryPolicy.MaxDelay)
+	}
+	return time.Duration(delay)
+}
+
+// pow is a simple integer power function
+func pow(base float64, exp float64) float64 {
+	result := 1.0
+	for i := 0.0; i < exp; i++ {
+		result *= base
+	}
+	return result
+}
+
+// Stats returns broker statistics
+func (b *EventBroker) Stats(ctx context.Context) (*BrokerStats, error) {
+	providerStats, err := b.provider.Stats(ctx)
+	if err != nil {
+		logger.Warn("Failed to get provider stats: %v", err)
+	}
+
+	stats := &BrokerStats{
+		InstanceID:        b.instanceID,
+		Mode:              b.mode,
+		IsRunning:         b.isRunning.Load(),
+		TotalPublished:    b.statsPublished.Load(),
+		TotalProcessed:    b.statsProcessed.Load(),
+		TotalFailed:       b.statsFailed.Load(),
+		ActiveSubscribers: b.subscriptions.Count(),
+		ProviderStats:     providerStats,
+	}
+
+	// Add async-specific stats
+	if b.mode == ProcessingModeAsync && b.workerPool != nil {
+		stats.QueueSize = b.workerPool.QueueSize()
+		stats.ActiveWorkers = b.workerPool.ActiveWorkers()
+	}
+
+	return stats, nil
+}
+
+// InstanceID returns the instance ID
+func (b *EventBroker) InstanceID() string {
+	return b.instanceID
+}

pkg/eventbroker/broker_test.go

@@ -0,0 +1,524 @@
+package eventbroker
+
+import (
+	"context"
+	"errors"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+)
+
+func TestNewBroker(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+		MaxEvents:  1000,
+	})
+
+	tests := []struct {
+		name      string
+		opts      Options
+		wantError bool
+	}{
+		{
+			name: "valid options",
+			opts: Options{
+				Provider:   provider,
+				InstanceID: "test-instance",
+				Mode:       ProcessingModeSync,
+			},
+			wantError: false,
+		},
+		{
+			name: "missing provider",
+			opts: Options{
+				InstanceID: "test-instance",
+			},
+			wantError: true,
+		},
+		{
+			name: "missing instance ID",
+			opts: Options{
+				Provider: provider,
+			},
+			wantError: true,
+		},
+		{
+			name: "async mode with defaults",
+			opts: Options{
+				Provider:   provider,
+				InstanceID: "test-instance",
+				Mode:       ProcessingModeAsync,
+			},
+			wantError: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			broker, err := NewBroker(tt.opts)
+			if (err != nil) != tt.wantError {
+				t.Errorf("NewBroker() error = %v, wantError %v", err, tt.wantError)
+			}
+			if err == nil && broker == nil {
+				t.Error("Expected non-nil broker")
+			}
+		})
+	}
+}
+
+func TestBrokerStartStop(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, err := NewBroker(Options{
+		Provider:   provider,
+		InstanceID: "test-instance",
+		Mode:       ProcessingModeSync,
+	})
+	if err != nil {
+		t.Fatalf("Failed to create broker: %v", err)
+	}
+
+	// Test Start
+	if err := broker.Start(context.Background()); err != nil {
+		t.Fatalf("Failed to start broker: %v", err)
+	}
+
+	// Test double start (should fail)
+	if err := broker.Start(context.Background()); err == nil {
+		t.Error("Expected error on double start")
+	}
+
+	// Test Stop
+	if err := broker.Stop(context.Background()); err != nil {
+		t.Fatalf("Failed to stop broker: %v", err)
+	}
+
+	// Test double stop (should not fail)
+	if err := broker.Stop(context.Background()); err != nil {
+		t.Error("Double stop should not fail")
+	}
+}
+
+func TestBrokerPublishSync(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:   provider,
+		InstanceID: "test-instance",
+		Mode:       ProcessingModeSync,
+	})
+	broker.Start(context.Background())
+	defer broker.Stop(context.Background())
+
+	// Subscribe to events
+	called := false
+	var receivedEvent *Event
+	broker.Subscribe("test.*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		called = true
+		receivedEvent = event
+		return nil
+	}))
+
+	// Publish event
+	event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+	err := broker.PublishSync(context.Background(), event)
+	if err != nil {
+		t.Fatalf("PublishSync failed: %v", err)
+	}
+
+	// Verify handler was called
+	if !called {
+		t.Error("Expected handler to be called")
+	}
+	if receivedEvent == nil || receivedEvent.ID != event.ID {
+		t.Error("Expected to receive the published event")
+	}
+
+	// Verify event status
+	if event.Status != EventStatusCompleted {
+		t.Errorf("Expected status %s, got %s", EventStatusCompleted, event.Status)
+	}
+}
+
+func TestBrokerPublishAsync(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:    provider,
+		InstanceID:  "test-instance",
+		Mode:        ProcessingModeAsync,
+		WorkerCount: 2,
+		BufferSize:  10,
+	})
+	broker.Start(context.Background())
+	defer broker.Stop(context.Background())
+
+	// Subscribe to events
+	var callCount atomic.Int32
+	broker.Subscribe("test.*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		callCount.Add(1)
+		return nil
+	}))
+
+	// Publish multiple events
+	for i := 0; i < 5; i++ {
+		event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+		if err := broker.PublishAsync(context.Background(), event); err != nil {
+			t.Fatalf("PublishAsync failed: %v", err)
+		}
+	}
+
+	// Wait for events to be processed
+	time.Sleep(100 * time.Millisecond)
+
+	if callCount.Load() != 5 {
+		t.Errorf("Expected 5 handler calls, got %d", callCount.Load())
+	}
+}
+
+func TestBrokerPublishBeforeStart(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:   provider,
+		InstanceID: "test-instance",
+	})
+
+	event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+	err := broker.Publish(context.Background(), event)
+	if err == nil {
+		t.Error("Expected error when publishing before start")
+	}
+}
+
+func TestBrokerHandlerError(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:   provider,
+		InstanceID: "test-instance",
+		Mode:       ProcessingModeSync,
+		RetryPolicy: &RetryPolicy{
+			MaxRetries:    2,
+			InitialDelay:  10 * time.Millisecond,
+			MaxDelay:      100 * time.Millisecond,
+			BackoffFactor: 2.0,
+		},
+	})
+	broker.Start(context.Background())
+	defer broker.Stop(context.Background())
+
+	// Subscribe with failing handler
+	var callCount atomic.Int32
+	broker.Subscribe("test.*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		callCount.Add(1)
+		return errors.New("handler error")
+	}))
+
+	// Publish event
+	event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+	err := broker.PublishSync(context.Background(), event)
+
+	// Should fail after retries
+	if err == nil {
+		t.Error("Expected error from handler")
+	}
+
+	// Should have been called MaxRetries+1 times (initial + retries)
+	if callCount.Load() != 3 {
+		t.Errorf("Expected 3 calls (1 initial + 2 retries), got %d", callCount.Load())
+	}
+
+	// Event should be marked as failed
+	if event.Status != EventStatusFailed {
+		t.Errorf("Expected status %s, got %s", EventStatusFailed, event.Status)
+	}
+}
+
+func TestBrokerMultipleHandlers(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:   provider,
+		InstanceID: "test-instance",
+		Mode:       ProcessingModeSync,
+	})
+	broker.Start(context.Background())
+	defer broker.Stop(context.Background())
+
+	// Subscribe multiple handlers
+	var called1, called2, called3 bool
+	broker.Subscribe("test.*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		called1 = true
+		return nil
+	}))
+	broker.Subscribe("test.event", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		called2 = true
+		return nil
+	}))
+	broker.Subscribe("*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		called3 = true
+		return nil
+	}))
+
+	// Publish event
+	event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+	broker.PublishSync(context.Background(), event)
+
+	// All handlers should be called
+	if !called1 || !called2 || !called3 {
+		t.Error("Expected all handlers to be called")
+	}
+}
+
+func TestBrokerUnsubscribe(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:   provider,
+		InstanceID: "test-instance",
+		Mode:       ProcessingModeSync,
+	})
+	broker.Start(context.Background())
+	defer broker.Stop(context.Background())
+
+	// Subscribe
+	called := false
+	id, _ := broker.Subscribe("test.*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		called = true
+		return nil
+	}))
+
+	// Unsubscribe
+	if err := broker.Unsubscribe(id); err != nil {
+		t.Fatalf("Unsubscribe failed: %v", err)
+	}
+
+	// Publish event
+	event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+	broker.PublishSync(context.Background(), event)
+
+	// Handler should not be called
+	if called {
+		t.Error("Expected handler not to be called after unsubscribe")
+	}
+}
+
+func TestBrokerStats(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:   provider,
+		InstanceID: "test-instance",
+		Mode:       ProcessingModeSync,
+	})
+	broker.Start(context.Background())
+	defer broker.Stop(context.Background())
+
+	// Subscribe
+	broker.Subscribe("test.*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		return nil
+	}))
+
+	// Publish events
+	for i := 0; i < 3; i++ {
+		event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+		broker.PublishSync(context.Background(), event)
+	}
+
+	// Get stats
+	stats, err := broker.Stats(context.Background())
+	if err != nil {
+		t.Fatalf("Stats failed: %v", err)
+	}
+
+	if stats.InstanceID != "test-instance" {
+		t.Errorf("Expected instance ID 'test-instance', got %s", stats.InstanceID)
+	}
+	if stats.TotalPublished != 3 {
+		t.Errorf("Expected 3 published events, got %d", stats.TotalPublished)
+	}
+	if stats.TotalProcessed != 3 {
+		t.Errorf("Expected 3 processed events, got %d", stats.TotalProcessed)
+	}
+	if stats.ActiveSubscribers != 1 {
+		t.Errorf("Expected 1 active subscriber, got %d", stats.ActiveSubscribers)
+	}
+}
+
+func TestBrokerInstanceID(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:   provider,
+		InstanceID: "my-instance",
+	})
+
+	if broker.InstanceID() != "my-instance" {
+		t.Errorf("Expected instance ID 'my-instance', got %s", broker.InstanceID())
+	}
+}
+
+func TestBrokerConcurrentPublish(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:    provider,
+		InstanceID:  "test-instance",
+		Mode:        ProcessingModeAsync,
+		WorkerCount: 5,
+		BufferSize:  100,
+	})
+	broker.Start(context.Background())
+	defer broker.Stop(context.Background())
+
+	var callCount atomic.Int32
+	broker.Subscribe("test.*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		callCount.Add(1)
+		return nil
+	}))
+
+	// Publish concurrently
+	var wg sync.WaitGroup
+	for i := 0; i < 50; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+			broker.PublishAsync(context.Background(), event)
+		}()
+	}
+
+	wg.Wait()
+	time.Sleep(200 * time.Millisecond) // Wait for async processing
+
+	if callCount.Load() != 50 {
+		t.Errorf("Expected 50 handler calls, got %d", callCount.Load())
+	}
+}
+
+func TestBrokerGracefulShutdown(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	broker, _ := NewBroker(Options{
+		Provider:    provider,
+		InstanceID:  "test-instance",
+		Mode:        ProcessingModeAsync,
+		WorkerCount: 2,
+		BufferSize:  10,
+	})
+	broker.Start(context.Background())
+
+	var processedCount atomic.Int32
+	broker.Subscribe("test.*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		time.Sleep(50 * time.Millisecond) // Simulate work
+		processedCount.Add(1)
+		return nil
+	}))
+
+	// Publish events
+	for i := 0; i < 5; i++ {
+		event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+		broker.PublishAsync(context.Background(), event)
+	}
+
+	// Stop broker (should wait for events to be processed)
+	if err := broker.Stop(context.Background()); err != nil {
+		t.Fatalf("Stop failed: %v", err)
+	}
+
+	// All events should be processed
+	if processedCount.Load() != 5 {
+		t.Errorf("Expected 5 processed events, got %d", processedCount.Load())
+	}
+}
+
+func TestBrokerDefaultRetryPolicy(t *testing.T) {
+	policy := DefaultRetryPolicy()
+
+	if policy.MaxRetries != 3 {
+		t.Errorf("Expected MaxRetries 3, got %d", policy.MaxRetries)
+	}
+	if policy.InitialDelay != 1*time.Second {
+		t.Errorf("Expected InitialDelay 1s, got %v", policy.InitialDelay)
+	}
+	if policy.BackoffFactor != 2.0 {
+		t.Errorf("Expected BackoffFactor 2.0, got %f", policy.BackoffFactor)
+	}
+}
+
+func TestBrokerProcessingModes(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	tests := []struct {
+		name string
+		mode ProcessingMode
+	}{
+		{"sync mode", ProcessingModeSync},
+		{"async mode", ProcessingModeAsync},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			broker, _ := NewBroker(Options{
+				Provider:   provider,
+				InstanceID: "test-instance",
+				Mode:       tt.mode,
+			})
+			broker.Start(context.Background())
+			defer broker.Stop(context.Background())
+
+			called := false
+			broker.Subscribe("test.*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+				called = true
+				return nil
+			}))
+
+			event := NewEvent(EventSourceSystem, "test.event")
+	event.InstanceID = "test-instance"
+			broker.Publish(context.Background(), event)
+
+			if tt.mode == ProcessingModeAsync {
+				time.Sleep(50 * time.Millisecond)
+			}
+
+			if !called {
+				t.Error("Expected handler to be called")
+			}
+		})
+	}
+}

pkg/eventbroker/event.go

@@ -0,0 +1,175 @@
+package eventbroker
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// EventSource represents where an event originated from
+type EventSource string
+
+const (
+	EventSourceDatabase  EventSource = "database"
+	EventSourceWebSocket EventSource = "websocket"
+	EventSourceFrontend  EventSource = "frontend"
+	EventSourceSystem    EventSource = "system"
+	EventSourceInternal  EventSource = "internal"
+)
+
+// EventStatus represents the current state of an event
+type EventStatus string
+
+const (
+	EventStatusPending    EventStatus = "pending"
+	EventStatusProcessing EventStatus = "processing"
+	EventStatusCompleted  EventStatus = "completed"
+	EventStatusFailed     EventStatus = "failed"
+)
+
+// Event represents a single event in the system with complete metadata
+type Event struct {
+	// Identification
+	ID string `json:"id" db:"id"`
+
+	// Source & Classification
+	Source EventSource `json:"source" db:"source"`
+	Type   string      `json:"type" db:"type"` // Pattern: schema.entity.operation
+
+	// Status Tracking
+	Status     EventStatus `json:"status" db:"status"`
+	RetryCount int         `json:"retry_count" db:"retry_count"`
+	Error      string      `json:"error,omitempty" db:"error"`
+
+	// Payload
+	Payload json.RawMessage `json:"payload" db:"payload"`
+
+	// Context Information
+	UserID     int    `json:"user_id" db:"user_id"`
+	SessionID  string `json:"session_id" db:"session_id"`
+	InstanceID string `json:"instance_id" db:"instance_id"`
+
+	// Database Context
+	Schema    string `json:"schema" db:"schema"`
+	Entity    string `json:"entity" db:"entity"`
+	Operation string `json:"operation" db:"operation"` // create, update, delete, read
+
+	// Timestamps
+	CreatedAt   time.Time  `json:"created_at" db:"created_at"`
+	ProcessedAt *time.Time `json:"processed_at,omitempty" db:"processed_at"`
+	CompletedAt *time.Time `json:"completed_at,omitempty" db:"completed_at"`
+
+	// Extensibility
+	Metadata map[string]interface{} `json:"metadata" db:"metadata"`
+}
+
+// NewEvent creates a new event with defaults
+func NewEvent(source EventSource, eventType string) *Event {
+	return &Event{
+		ID:         uuid.New().String(),
+		Source:     source,
+		Type:       eventType,
+		Status:     EventStatusPending,
+		CreatedAt:  time.Now(),
+		Metadata:   make(map[string]interface{}),
+		RetryCount: 0,
+	}
+}
+
+// EventType generates a type string from schema, entity, and operation
+// Pattern: schema.entity.operation (e.g., "public.users.create")
+func EventType(schema, entity, operation string) string {
+	return fmt.Sprintf("%s.%s.%s", schema, entity, operation)
+}
+
+// MarkProcessing marks the event as being processed
+func (e *Event) MarkProcessing() {
+	e.Status = EventStatusProcessing
+	now := time.Now()
+	e.ProcessedAt = &now
+}
+
+// MarkCompleted marks the event as successfully completed
+func (e *Event) MarkCompleted() {
+	e.Status = EventStatusCompleted
+	now := time.Now()
+	e.CompletedAt = &now
+}
+
+// MarkFailed marks the event as failed with an error message
+func (e *Event) MarkFailed(err error) {
+	e.Status = EventStatusFailed
+	e.Error = err.Error()
+	now := time.Now()
+	e.CompletedAt = &now
+}
+
+// IncrementRetry increments the retry counter
+func (e *Event) IncrementRetry() {
+	e.RetryCount++
+}
+
+// SetPayload sets the event payload from any value by marshaling to JSON
+func (e *Event) SetPayload(v interface{}) error {
+	data, err := json.Marshal(v)
+	if err != nil {
+		return fmt.Errorf("failed to marshal payload: %w", err)
+	}
+	e.Payload = data
+	return nil
+}
+
+// GetPayload unmarshals the payload into the provided value
+func (e *Event) GetPayload(v interface{}) error {
+	if len(e.Payload) == 0 {
+		return fmt.Errorf("payload is empty")
+	}
+	if err := json.Unmarshal(e.Payload, v); err != nil {
+		return fmt.Errorf("failed to unmarshal payload: %w", err)
+	}
+	return nil
+}
+
+// Clone creates a deep copy of the event
+func (e *Event) Clone() *Event {
+	clone := *e
+
+	// Deep copy metadata
+	if e.Metadata != nil {
+		clone.Metadata = make(map[string]interface{})
+		for k, v := range e.Metadata {
+			clone.Metadata[k] = v
+		}
+	}
+
+	// Deep copy timestamps
+	if e.ProcessedAt != nil {
+		t := *e.ProcessedAt
+		clone.ProcessedAt = &t
+	}
+	if e.CompletedAt != nil {
+		t := *e.CompletedAt
+		clone.CompletedAt = &t
+	}
+
+	return &clone
+}
+
+// Validate performs basic validation on the event
+func (e *Event) Validate() error {
+	if e.ID == "" {
+		return fmt.Errorf("event ID is required")
+	}
+	if e.Source == "" {
+		return fmt.Errorf("event source is required")
+	}
+	if e.Type == "" {
+		return fmt.Errorf("event type is required")
+	}
+	if e.InstanceID == "" {
+		return fmt.Errorf("instance ID is required")
+	}
+	return nil
+}

pkg/eventbroker/event_test.go

@@ -0,0 +1,314 @@
+package eventbroker
+
+import (
+	"encoding/json"
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestNewEvent(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+
+	if event.ID == "" {
+		t.Error("Expected event ID to be generated")
+	}
+	if event.Source != EventSourceDatabase {
+		t.Errorf("Expected source %s, got %s", EventSourceDatabase, event.Source)
+	}
+	if event.Type != "public.users.create" {
+		t.Errorf("Expected type 'public.users.create', got %s", event.Type)
+	}
+	if event.Status != EventStatusPending {
+		t.Errorf("Expected status %s, got %s", EventStatusPending, event.Status)
+	}
+	if event.CreatedAt.IsZero() {
+		t.Error("Expected CreatedAt to be set")
+	}
+	if event.Metadata == nil {
+		t.Error("Expected Metadata to be initialized")
+	}
+}
+
+func TestEventType(t *testing.T) {
+	tests := []struct {
+		schema    string
+		entity    string
+		operation string
+		expected  string
+	}{
+		{"public", "users", "create", "public.users.create"},
+		{"admin", "roles", "update", "admin.roles.update"},
+		{"", "system", "start", ".system.start"}, // Empty schema results in leading dot
+	}
+
+	for _, tt := range tests {
+		result := EventType(tt.schema, tt.entity, tt.operation)
+		if result != tt.expected {
+			t.Errorf("EventType(%q, %q, %q) = %q, expected %q",
+				tt.schema, tt.entity, tt.operation, result, tt.expected)
+		}
+	}
+}
+
+func TestEventValidate(t *testing.T) {
+	tests := []struct {
+		name      string
+		event     *Event
+		wantError bool
+	}{
+		{
+			name: "valid event",
+			event: func() *Event {
+				e := NewEvent(EventSourceDatabase, "public.users.create")
+				e.InstanceID = "test-instance"
+				return e
+			}(),
+			wantError: false,
+		},
+		{
+			name: "missing ID",
+			event: &Event{
+				Source: EventSourceDatabase,
+				Type:   "public.users.create",
+				Status: EventStatusPending,
+			},
+			wantError: true,
+		},
+		{
+			name: "missing source",
+			event: &Event{
+				ID:     "test-id",
+				Type:   "public.users.create",
+				Status: EventStatusPending,
+			},
+			wantError: true,
+		},
+		{
+			name: "missing type",
+			event: &Event{
+				ID:     "test-id",
+				Source: EventSourceDatabase,
+				Status: EventStatusPending,
+			},
+			wantError: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := tt.event.Validate()
+			if (err != nil) != tt.wantError {
+				t.Errorf("Event.Validate() error = %v, wantError %v", err, tt.wantError)
+			}
+		})
+	}
+}
+
+func TestEventSetPayload(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+
+	payload := map[string]interface{}{
+		"id":   1,
+		"name": "John Doe",
+		"email": "john@example.com",
+	}
+
+	err := event.SetPayload(payload)
+	if err != nil {
+		t.Fatalf("SetPayload failed: %v", err)
+	}
+
+	if event.Payload == nil {
+		t.Fatal("Expected payload to be set")
+	}
+
+	// Verify payload can be unmarshaled
+	var result map[string]interface{}
+	if err := json.Unmarshal(event.Payload, &result); err != nil {
+		t.Fatalf("Failed to unmarshal payload: %v", err)
+	}
+
+	if result["name"] != "John Doe" {
+		t.Errorf("Expected name 'John Doe', got %v", result["name"])
+	}
+}
+
+func TestEventGetPayload(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+
+	payload := map[string]interface{}{
+		"id":   float64(1), // JSON unmarshals numbers as float64
+		"name": "John Doe",
+	}
+
+	if err := event.SetPayload(payload); err != nil {
+		t.Fatalf("SetPayload failed: %v", err)
+	}
+
+	var result map[string]interface{}
+	if err := event.GetPayload(&result); err != nil {
+		t.Fatalf("GetPayload failed: %v", err)
+	}
+
+	if result["name"] != "John Doe" {
+		t.Errorf("Expected name 'John Doe', got %v", result["name"])
+	}
+}
+
+func TestEventMarkProcessing(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	event.MarkProcessing()
+
+	if event.Status != EventStatusProcessing {
+		t.Errorf("Expected status %s, got %s", EventStatusProcessing, event.Status)
+	}
+	if event.ProcessedAt == nil {
+		t.Error("Expected ProcessedAt to be set")
+	}
+}
+
+func TestEventMarkCompleted(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	event.MarkCompleted()
+
+	if event.Status != EventStatusCompleted {
+		t.Errorf("Expected status %s, got %s", EventStatusCompleted, event.Status)
+	}
+	if event.CompletedAt == nil {
+		t.Error("Expected CompletedAt to be set")
+	}
+}
+
+func TestEventMarkFailed(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	testErr := errors.New("test error")
+	event.MarkFailed(testErr)
+
+	if event.Status != EventStatusFailed {
+		t.Errorf("Expected status %s, got %s", EventStatusFailed, event.Status)
+	}
+	if event.Error != "test error" {
+		t.Errorf("Expected error %q, got %q", "test error", event.Error)
+	}
+	if event.CompletedAt == nil {
+		t.Error("Expected CompletedAt to be set")
+	}
+}
+
+func TestEventIncrementRetry(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+
+	initialCount := event.RetryCount
+	event.IncrementRetry()
+
+	if event.RetryCount != initialCount+1 {
+		t.Errorf("Expected retry count %d, got %d", initialCount+1, event.RetryCount)
+	}
+}
+
+func TestEventJSONMarshaling(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	event.UserID = 123
+	event.SessionID = "session-123"
+	event.InstanceID = "instance-1"
+	event.Schema = "public"
+	event.Entity = "users"
+	event.Operation = "create"
+	event.SetPayload(map[string]interface{}{"name": "Test"})
+
+	// Marshal to JSON
+	data, err := json.Marshal(event)
+	if err != nil {
+		t.Fatalf("Failed to marshal event: %v", err)
+	}
+
+	// Unmarshal back
+	var decoded Event
+	if err := json.Unmarshal(data, &decoded); err != nil {
+		t.Fatalf("Failed to unmarshal event: %v", err)
+	}
+
+	// Verify fields
+	if decoded.ID != event.ID {
+		t.Errorf("Expected ID %s, got %s", event.ID, decoded.ID)
+	}
+	if decoded.Source != event.Source {
+		t.Errorf("Expected source %s, got %s", event.Source, decoded.Source)
+	}
+	if decoded.UserID != event.UserID {
+		t.Errorf("Expected UserID %d, got %d", event.UserID, decoded.UserID)
+	}
+}
+
+func TestEventStatusString(t *testing.T) {
+	statuses := []EventStatus{
+		EventStatusPending,
+		EventStatusProcessing,
+		EventStatusCompleted,
+		EventStatusFailed,
+	}
+
+	for _, status := range statuses {
+		if string(status) == "" {
+			t.Errorf("EventStatus %v has empty string representation", status)
+		}
+	}
+}
+
+func TestEventSourceString(t *testing.T) {
+	sources := []EventSource{
+		EventSourceDatabase,
+		EventSourceWebSocket,
+		EventSourceFrontend,
+		EventSourceSystem,
+		EventSourceInternal,
+	}
+
+	for _, source := range sources {
+		if string(source) == "" {
+			t.Errorf("EventSource %v has empty string representation", source)
+		}
+	}
+}
+
+func TestEventMetadata(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+
+	// Test setting metadata
+	event.Metadata["key1"] = "value1"
+	event.Metadata["key2"] = 123
+
+	if event.Metadata["key1"] != "value1" {
+		t.Errorf("Expected metadata key1 to be 'value1', got %v", event.Metadata["key1"])
+	}
+	if event.Metadata["key2"] != 123 {
+		t.Errorf("Expected metadata key2 to be 123, got %v", event.Metadata["key2"])
+	}
+}
+
+func TestEventTimestamps(t *testing.T) {
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	createdAt := event.CreatedAt
+
+	// Wait a tiny bit to ensure timestamps differ
+	time.Sleep(time.Millisecond)
+
+	event.MarkProcessing()
+	if event.ProcessedAt == nil {
+		t.Fatal("ProcessedAt should be set")
+	}
+	if !event.ProcessedAt.After(createdAt) {
+		t.Error("ProcessedAt should be after CreatedAt")
+	}
+
+	time.Sleep(time.Millisecond)
+
+	event.MarkCompleted()
+	if event.CompletedAt == nil {
+		t.Fatal("CompletedAt should be set")
+	}
+	if !event.CompletedAt.After(*event.ProcessedAt) {
+		t.Error("CompletedAt should be after ProcessedAt")
+	}
+}

pkg/eventbroker/eventbroker.go

@@ -0,0 +1,160 @@
+package eventbroker
+
+import (
+	"context"
+	"fmt"
+	"sync"
+
+	"github.com/bitechdev/ResolveSpec/pkg/config"
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
+	"github.com/bitechdev/ResolveSpec/pkg/server"
+)
+
+var (
+	defaultBroker Broker
+	brokerMu      sync.RWMutex
+)
+
+// Initialize initializes the global event broker from configuration
+func Initialize(cfg config.EventBrokerConfig) error {
+	if !cfg.Enabled {
+		logger.Info("Event broker is disabled")
+		return nil
+	}
+
+	// Create provider
+	provider, err := NewProviderFromConfig(cfg)
+	if err != nil {
+		return fmt.Errorf("failed to create provider: %w", err)
+	}
+
+	// Parse mode
+	mode := ProcessingModeAsync
+	if cfg.Mode == "sync" {
+		mode = ProcessingModeSync
+	}
+
+	// Convert retry policy
+	retryPolicy := &RetryPolicy{
+		MaxRetries:    cfg.RetryPolicy.MaxRetries,
+		InitialDelay:  cfg.RetryPolicy.InitialDelay,
+		MaxDelay:      cfg.RetryPolicy.MaxDelay,
+		BackoffFactor: cfg.RetryPolicy.BackoffFactor,
+	}
+	if retryPolicy.MaxRetries == 0 {
+		retryPolicy = DefaultRetryPolicy()
+	}
+
+	// Create broker options
+	opts := Options{
+		Provider:    provider,
+		Mode:        mode,
+		WorkerCount: cfg.WorkerCount,
+		BufferSize:  cfg.BufferSize,
+		RetryPolicy: retryPolicy,
+		InstanceID:  getInstanceID(cfg.InstanceID),
+	}
+
+	// Create broker
+	broker, err := NewBroker(opts)
+	if err != nil {
+		return fmt.Errorf("failed to create broker: %w", err)
+	}
+
+	// Start broker
+	if err := broker.Start(context.Background()); err != nil {
+		return fmt.Errorf("failed to start broker: %w", err)
+	}
+
+	// Set as default
+	SetDefaultBroker(broker)
+
+	// Register shutdown callback
+	RegisterShutdown(broker)
+
+	logger.Info("Event broker initialized successfully (provider: %s, mode: %s, instance: %s)",
+		cfg.Provider, cfg.Mode, opts.InstanceID)
+
+	return nil
+}
+
+// SetDefaultBroker sets the default global broker
+func SetDefaultBroker(broker Broker) {
+	brokerMu.Lock()
+	defer brokerMu.Unlock()
+	defaultBroker = broker
+}
+
+// GetDefaultBroker returns the default global broker
+func GetDefaultBroker() Broker {
+	brokerMu.RLock()
+	defer brokerMu.RUnlock()
+	return defaultBroker
+}
+
+// IsInitialized returns true if the default broker is initialized
+func IsInitialized() bool {
+	return GetDefaultBroker() != nil
+}
+
+// Publish publishes an event using the default broker
+func Publish(ctx context.Context, event *Event) error {
+	broker := GetDefaultBroker()
+	if broker == nil {
+		return fmt.Errorf("event broker not initialized")
+	}
+	return broker.Publish(ctx, event)
+}
+
+// PublishSync publishes an event synchronously using the default broker
+func PublishSync(ctx context.Context, event *Event) error {
+	broker := GetDefaultBroker()
+	if broker == nil {
+		return fmt.Errorf("event broker not initialized")
+	}
+	return broker.PublishSync(ctx, event)
+}
+
+// PublishAsync publishes an event asynchronously using the default broker
+func PublishAsync(ctx context.Context, event *Event) error {
+	broker := GetDefaultBroker()
+	if broker == nil {
+		return fmt.Errorf("event broker not initialized")
+	}
+	return broker.PublishAsync(ctx, event)
+}
+
+// Subscribe subscribes to events using the default broker
+func Subscribe(pattern string, handler EventHandler) (SubscriptionID, error) {
+	broker := GetDefaultBroker()
+	if broker == nil {
+		return "", fmt.Errorf("event broker not initialized")
+	}
+	return broker.Subscribe(pattern, handler)
+}
+
+// Unsubscribe unsubscribes from events using the default broker
+func Unsubscribe(id SubscriptionID) error {
+	broker := GetDefaultBroker()
+	if broker == nil {
+		return fmt.Errorf("event broker not initialized")
+	}
+	return broker.Unsubscribe(id)
+}
+
+// Stats returns statistics from the default broker
+func Stats(ctx context.Context) (*BrokerStats, error) {
+	broker := GetDefaultBroker()
+	if broker == nil {
+		return nil, fmt.Errorf("event broker not initialized")
+	}
+	return broker.Stats(ctx)
+}
+
+// RegisterShutdown registers the broker's shutdown with the server shutdown callbacks
+func RegisterShutdown(broker Broker) {
+	server.RegisterShutdownCallback(func(ctx context.Context) error {
+		logger.Info("Shutting down event broker...")
+		return broker.Stop(ctx)
+	})
+}

pkg/eventbroker/example_usage.go

@@ -0,0 +1,266 @@
+// nolint
+package eventbroker
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
+)
+
+// Example demonstrates basic usage of the event broker
+func Example() {
+	// 1. Create a memory provider
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID:      "example-instance",
+		MaxEvents:       1000,
+		CleanupInterval: 5 * time.Minute,
+		MaxAge:          1 * time.Hour,
+	})
+
+	// 2. Create a broker
+	broker, err := NewBroker(Options{
+		Provider:    provider,
+		Mode:        ProcessingModeAsync,
+		WorkerCount: 5,
+		BufferSize:  100,
+		RetryPolicy: DefaultRetryPolicy(),
+		InstanceID:  "example-instance",
+	})
+	if err != nil {
+		logger.Error("Failed to create broker: %v", err)
+		return
+	}
+
+	// 3. Start the broker
+	if err := broker.Start(context.Background()); err != nil {
+		logger.Error("Failed to start broker: %v", err)
+		return
+	}
+	defer func() {
+		err := broker.Stop(context.Background())
+		if err != nil {
+			logger.Error("Failed to stop broker: %v", err)
+		}
+	}()
+
+	// 4. Subscribe to events
+	broker.Subscribe("public.users.*", EventHandlerFunc(
+		func(ctx context.Context, event *Event) error {
+			logger.Info("User event: %s (operation: %s)", event.Type, event.Operation)
+			return nil
+		},
+	))
+
+	broker.Subscribe("*.*.create", EventHandlerFunc(
+		func(ctx context.Context, event *Event) error {
+			logger.Info("Create event: %s.%s", event.Schema, event.Entity)
+			return nil
+		},
+	))
+
+	// 5. Publish events
+	ctx := context.Background()
+
+	// Database event
+	dbEvent := NewEvent(EventSourceDatabase, EventType("public", "users", "create"))
+	dbEvent.InstanceID = "example-instance"
+	dbEvent.UserID = 123
+	dbEvent.SessionID = "session-456"
+	dbEvent.Schema = "public"
+	dbEvent.Entity = "users"
+	dbEvent.Operation = "create"
+	dbEvent.SetPayload(map[string]interface{}{
+		"id":    123,
+		"name":  "John Doe",
+		"email": "john@example.com",
+	})
+
+	if err := broker.PublishAsync(ctx, dbEvent); err != nil {
+		logger.Error("Failed to publish event: %v", err)
+	}
+
+	// WebSocket event
+	wsEvent := NewEvent(EventSourceWebSocket, "chat.message")
+	wsEvent.InstanceID = "example-instance"
+	wsEvent.UserID = 123
+	wsEvent.SessionID = "session-456"
+	wsEvent.SetPayload(map[string]interface{}{
+		"room":    "general",
+		"message": "Hello, World!",
+	})
+
+	if err := broker.PublishAsync(ctx, wsEvent); err != nil {
+		logger.Error("Failed to publish event: %v", err)
+	}
+
+	// 6. Get statistics
+	time.Sleep(1 * time.Second) // Wait for processing
+	stats, _ := broker.Stats(ctx)
+	logger.Info("Broker stats: %d published, %d processed", stats.TotalPublished, stats.TotalProcessed)
+}
+
+// ExampleWithHooks demonstrates integration with the hook system
+func ExampleWithHooks() {
+	// This would typically be called in your main.go or initialization code
+	// after setting up your restheadspec.Handler
+
+	// Pseudo-code (actual implementation would use real handler):
+	/*
+		broker := eventbroker.GetDefaultBroker()
+		hookRegistry := handler.Hooks()
+
+		// Register CRUD hooks
+		config := eventbroker.DefaultCRUDHookConfig()
+		config.EnableRead = false // Disable read events for performance
+
+		if err := eventbroker.RegisterCRUDHooks(broker, hookRegistry, config); err != nil {
+			logger.Error("Failed to register CRUD hooks: %v", err)
+		}
+
+		// Now all CRUD operations will automatically publish events
+	*/
+}
+
+// ExampleSubscriptionPatterns demonstrates different subscription patterns
+func ExampleSubscriptionPatterns() {
+	broker := GetDefaultBroker()
+	if broker == nil {
+		return
+	}
+
+	// Pattern 1: Subscribe to all events from a specific entity
+	broker.Subscribe("public.users.*", EventHandlerFunc(
+		func(ctx context.Context, event *Event) error {
+			fmt.Printf("User event: %s\n", event.Operation)
+			return nil
+		},
+	))
+
+	// Pattern 2: Subscribe to a specific operation across all entities
+	broker.Subscribe("*.*.create", EventHandlerFunc(
+		func(ctx context.Context, event *Event) error {
+			fmt.Printf("Create event: %s.%s\n", event.Schema, event.Entity)
+			return nil
+		},
+	))
+
+	// Pattern 3: Subscribe to all events in a schema
+	broker.Subscribe("public.*.*", EventHandlerFunc(
+		func(ctx context.Context, event *Event) error {
+			fmt.Printf("Public schema event: %s.%s\n", event.Entity, event.Operation)
+			return nil
+		},
+	))
+
+	// Pattern 4: Subscribe to everything (use with caution)
+	broker.Subscribe("*", EventHandlerFunc(
+		func(ctx context.Context, event *Event) error {
+			fmt.Printf("Any event: %s\n", event.Type)
+			return nil
+		},
+	))
+}
+
+// ExampleErrorHandling demonstrates error handling in event handlers
+func ExampleErrorHandling() {
+	broker := GetDefaultBroker()
+	if broker == nil {
+		return
+	}
+
+	// Handler that may fail
+	broker.Subscribe("public.users.create", EventHandlerFunc(
+		func(ctx context.Context, event *Event) error {
+			// Simulate processing
+			var user struct {
+				ID    int    `json:"id"`
+				Email string `json:"email"`
+			}
+
+			if err := event.GetPayload(&user); err != nil {
+				return fmt.Errorf("invalid payload: %w", err)
+			}
+
+			// Validate
+			if user.Email == "" {
+				return fmt.Errorf("email is required")
+			}
+
+			// Process (e.g., send email)
+			logger.Info("Sending welcome email to %s", user.Email)
+
+			return nil
+		},
+	))
+}
+
+// ExampleConfiguration demonstrates initializing from configuration
+func ExampleConfiguration() {
+	// This would typically be in your main.go
+
+	// Pseudo-code:
+	/*
+		// Load configuration
+		cfgMgr := config.NewManager()
+		if err := cfgMgr.Load(); err != nil {
+			logger.Fatal("Failed to load config: %v", err)
+		}
+
+		cfg, err := cfgMgr.GetConfig()
+		if err != nil {
+			logger.Fatal("Failed to get config: %v", err)
+		}
+
+		// Initialize event broker
+		if err := eventbroker.Initialize(cfg.EventBroker); err != nil {
+			logger.Fatal("Failed to initialize event broker: %v", err)
+		}
+
+		// Use the default broker
+		eventbroker.Subscribe("*.*.create", eventbroker.EventHandlerFunc(
+			func(ctx context.Context, event *eventbroker.Event) error {
+				logger.Info("Created: %s.%s", event.Schema, event.Entity)
+				return nil
+			},
+		))
+	*/
+}
+
+// ExampleYAMLConfiguration shows example YAML configuration
+const ExampleYAMLConfiguration = `
+event_broker:
+  enabled: true
+  provider: memory  # memory, redis, nats, database
+  mode: async       # sync, async
+  worker_count: 10
+  buffer_size: 1000
+  instance_id: "${HOSTNAME}"
+
+  # Memory provider is default, no additional config needed
+
+  # Redis provider (when provider: redis)
+  redis:
+    stream_name: "resolvespec:events"
+    consumer_group: "resolvespec-workers"
+    host: "localhost"
+    port: 6379
+
+  # NATS provider (when provider: nats)
+  nats:
+    url: "nats://localhost:4222"
+    stream_name: "RESOLVESPEC_EVENTS"
+
+  # Database provider (when provider: database)
+  database:
+    table_name: "events"
+    channel: "resolvespec_events"
+
+  # Retry policy
+  retry_policy:
+    max_retries: 3
+    initial_delay: 1s
+    max_delay: 30s
+    backoff_factor: 2.0
+`

pkg/eventbroker/factory.go

@@ -0,0 +1,56 @@
+package eventbroker
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/bitechdev/ResolveSpec/pkg/config"
+)
+
+// NewProviderFromConfig creates a provider based on configuration
+func NewProviderFromConfig(cfg config.EventBrokerConfig) (Provider, error) {
+	switch cfg.Provider {
+	case "memory":
+		cleanupInterval := 5 * time.Minute
+		if cfg.Database.PollInterval > 0 {
+			cleanupInterval = cfg.Database.PollInterval
+		}
+
+		return NewMemoryProvider(MemoryProviderOptions{
+			InstanceID:      getInstanceID(cfg.InstanceID),
+			MaxEvents:       10000,
+			CleanupInterval: cleanupInterval,
+		}), nil
+
+	case "redis":
+		// Redis provider will be implemented in Phase 8
+		return nil, fmt.Errorf("redis provider not yet implemented")
+
+	case "nats":
+		// NATS provider will be implemented in Phase 9
+		return nil, fmt.Errorf("nats provider not yet implemented")
+
+	case "database":
+		// Database provider will be implemented in Phase 7
+		return nil, fmt.Errorf("database provider not yet implemented")
+
+	default:
+		return nil, fmt.Errorf("unknown provider: %s", cfg.Provider)
+	}
+}
+
+// getInstanceID returns the instance ID, defaulting to hostname if not specified
+func getInstanceID(configID string) string {
+	if configID != "" {
+		return configID
+	}
+
+	// Try to get hostname
+	if hostname, err := os.Hostname(); err == nil {
+		return hostname
+	}
+
+	// Fallback to a default
+	return "resolvespec-instance"
+}

pkg/eventbroker/handler.go

@@ -0,0 +1,17 @@
+package eventbroker
+
+import "context"
+
+// EventHandler processes an event
+type EventHandler interface {
+	Handle(ctx context.Context, event *Event) error
+}
+
+// EventHandlerFunc is a function adapter for EventHandler
+// This allows using regular functions as event handlers
+type EventHandlerFunc func(ctx context.Context, event *Event) error
+
+// Handle implements EventHandler
+func (f EventHandlerFunc) Handle(ctx context.Context, event *Event) error {
+	return f(ctx, event)
+}

pkg/eventbroker/hooks.go

@@ -0,0 +1,137 @@
+package eventbroker
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
+	"github.com/bitechdev/ResolveSpec/pkg/restheadspec"
+	"github.com/bitechdev/ResolveSpec/pkg/security"
+)
+
+// CRUDHookConfig configures which CRUD operations should trigger events
+type CRUDHookConfig struct {
+	EnableCreate bool
+	EnableRead   bool
+	EnableUpdate bool
+	EnableDelete bool
+}
+
+// DefaultCRUDHookConfig returns default configuration (all enabled)
+func DefaultCRUDHookConfig() *CRUDHookConfig {
+	return &CRUDHookConfig{
+		EnableCreate: true,
+		EnableRead:   false, // Typically disabled for performance
+		EnableUpdate: true,
+		EnableDelete: true,
+	}
+}
+
+// RegisterCRUDHooks registers event hooks for CRUD operations
+// This integrates with the restheadspec.HookRegistry to automatically
+// capture database events
+func RegisterCRUDHooks(broker Broker, hookRegistry *restheadspec.HookRegistry, config *CRUDHookConfig) error {
+	if broker == nil {
+		return fmt.Errorf("broker cannot be nil")
+	}
+	if hookRegistry == nil {
+		return fmt.Errorf("hookRegistry cannot be nil")
+	}
+	if config == nil {
+		config = DefaultCRUDHookConfig()
+	}
+
+	// Create hook handler factory
+	createHookHandler := func(operation string) restheadspec.HookFunc {
+		return func(hookCtx *restheadspec.HookContext) error {
+			// Get user context from Go context
+			userCtx, ok := security.GetUserContext(hookCtx.Context)
+			if !ok || userCtx == nil {
+				logger.Debug("No user context found in hook")
+				userCtx = &security.UserContext{} // Empty user context
+			}
+
+			// Create event
+			event := NewEvent(EventSourceDatabase, EventType(hookCtx.Schema, hookCtx.Entity, operation))
+			event.InstanceID = broker.InstanceID()
+			event.UserID = userCtx.UserID
+			event.SessionID = userCtx.SessionID
+			event.Schema = hookCtx.Schema
+			event.Entity = hookCtx.Entity
+			event.Operation = operation
+
+			// Set payload based on operation
+			var payload interface{}
+			switch operation {
+			case "create":
+				payload = hookCtx.Result
+			case "read":
+				payload = hookCtx.Result
+			case "update":
+				payload = map[string]interface{}{
+					"id":   hookCtx.ID,
+					"data": hookCtx.Data,
+				}
+			case "delete":
+				payload = map[string]interface{}{
+					"id": hookCtx.ID,
+				}
+			}
+
+			if payload != nil {
+				if err := event.SetPayload(payload); err != nil {
+					logger.Error("Failed to set event payload: %v", err)
+					payload = map[string]interface{}{"error": "failed to serialize payload"}
+					event.Payload, _ = json.Marshal(payload)
+				}
+			}
+
+			// Add metadata
+			if userCtx.UserName != "" {
+				event.Metadata["user_name"] = userCtx.UserName
+			}
+			if userCtx.Email != "" {
+				event.Metadata["user_email"] = userCtx.Email
+			}
+			if len(userCtx.Roles) > 0 {
+				event.Metadata["user_roles"] = userCtx.Roles
+			}
+			event.Metadata["table_name"] = hookCtx.TableName
+
+			// Publish asynchronously to not block CRUD operation
+			if err := broker.PublishAsync(hookCtx.Context, event); err != nil {
+				logger.Error("Failed to publish %s event for %s.%s: %v",
+					operation, hookCtx.Schema, hookCtx.Entity, err)
+				// Don't fail the CRUD operation if event publishing fails
+				return nil
+			}
+
+			logger.Debug("Published %s event for %s.%s (ID: %s)",
+				operation, hookCtx.Schema, hookCtx.Entity, event.ID)
+			return nil
+		}
+	}
+
+	// Register hooks based on configuration
+	if config.EnableCreate {
+		hookRegistry.Register(restheadspec.AfterCreate, createHookHandler("create"))
+		logger.Info("Registered event hook for CREATE operations")
+	}
+
+	if config.EnableRead {
+		hookRegistry.Register(restheadspec.AfterRead, createHookHandler("read"))
+		logger.Info("Registered event hook for READ operations")
+	}
+
+	if config.EnableUpdate {
+		hookRegistry.Register(restheadspec.AfterUpdate, createHookHandler("update"))
+		logger.Info("Registered event hook for UPDATE operations")
+	}
+
+	if config.EnableDelete {
+		hookRegistry.Register(restheadspec.AfterDelete, createHookHandler("delete"))
+		logger.Info("Registered event hook for DELETE operations")
+	}
+
+	return nil
+}

pkg/eventbroker/metrics.go

@@ -0,0 +1,28 @@
+package eventbroker
+
+import (
+	"time"
+
+	"github.com/bitechdev/ResolveSpec/pkg/metrics"
+)
+
+// recordEventPublished records an event publication metric
+func recordEventPublished(event *Event) {
+	if mp := metrics.GetProvider(); mp != nil {
+		mp.RecordEventPublished(string(event.Source), event.Type)
+	}
+}
+
+// recordEventProcessed records an event processing metric
+func recordEventProcessed(event *Event, duration time.Duration) {
+	if mp := metrics.GetProvider(); mp != nil {
+		mp.RecordEventProcessed(string(event.Source), event.Type, string(event.Status), duration)
+	}
+}
+
+// updateQueueSize updates the event queue size metric
+func updateQueueSize(size int64) {
+	if mp := metrics.GetProvider(); mp != nil {
+		mp.UpdateEventQueueSize(size)
+	}
+}

pkg/eventbroker/provider.go

@@ -0,0 +1,70 @@
+package eventbroker
+
+import (
+	"context"
+	"time"
+)
+
+// Provider defines the storage backend interface for events
+// Implementations: MemoryProvider, RedisProvider, NATSProvider, DatabaseProvider
+type Provider interface {
+	// Store stores an event
+	Store(ctx context.Context, event *Event) error
+
+	// Get retrieves an event by ID
+	Get(ctx context.Context, id string) (*Event, error)
+
+	// List lists events with optional filters
+	List(ctx context.Context, filter *EventFilter) ([]*Event, error)
+
+	// UpdateStatus updates the status of an event
+	UpdateStatus(ctx context.Context, id string, status EventStatus, errorMsg string) error
+
+	// Delete deletes an event by ID
+	Delete(ctx context.Context, id string) error
+
+	// Stream returns a channel of events for real-time consumption
+	// Used for cross-instance pub/sub
+	// The channel is closed when the context is canceled or an error occurs
+	Stream(ctx context.Context, pattern string) (<-chan *Event, error)
+
+	// Publish publishes an event to all subscribers (for distributed providers)
+	// For in-memory provider, this is the same as Store
+	// For Redis/NATS/Database, this triggers cross-instance delivery
+	Publish(ctx context.Context, event *Event) error
+
+	// Close closes the provider and releases resources
+	Close() error
+
+	// Stats returns provider statistics
+	Stats(ctx context.Context) (*ProviderStats, error)
+}
+
+// EventFilter defines filter criteria for listing events
+type EventFilter struct {
+	Source     *EventSource
+	Status     *EventStatus
+	UserID     *int
+	Schema     string
+	Entity     string
+	Operation  string
+	InstanceID string
+	StartTime  *time.Time
+	EndTime    *time.Time
+	Limit      int
+	Offset     int
+}
+
+// ProviderStats contains statistics about the provider
+type ProviderStats struct {
+	ProviderType      string                 `json:"provider_type"`
+	TotalEvents       int64                  `json:"total_events"`
+	PendingEvents     int64                  `json:"pending_events"`
+	ProcessingEvents  int64                  `json:"processing_events"`
+	CompletedEvents   int64                  `json:"completed_events"`
+	FailedEvents      int64                  `json:"failed_events"`
+	EventsPublished   int64                  `json:"events_published"`
+	EventsConsumed    int64                  `json:"events_consumed"`
+	ActiveSubscribers int                    `json:"active_subscribers"`
+	ProviderSpecific  map[string]interface{} `json:"provider_specific,omitempty"`
+}

pkg/eventbroker/provider_memory.go

@@ -0,0 +1,446 @@
+package eventbroker
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
+)
+
+// MemoryProvider implements Provider interface using in-memory storage
+// Features:
+// - Thread-safe event storage with RW mutex
+// - LRU eviction when max events reached
+// - In-process pub/sub (not cross-instance)
+// - Automatic cleanup of old completed events
+type MemoryProvider struct {
+	mu              sync.RWMutex
+	events          map[string]*Event
+	eventOrder      []string // For LRU tracking
+	subscribers     map[string][]chan *Event
+	instanceID      string
+	maxEvents       int
+	cleanupInterval time.Duration
+	maxAge          time.Duration
+
+	// Statistics
+	stats MemoryProviderStats
+
+	// Lifecycle
+	stopCleanup chan struct{}
+	wg          sync.WaitGroup
+	isRunning   atomic.Bool
+}
+
+// MemoryProviderStats contains statistics for the memory provider
+type MemoryProviderStats struct {
+	TotalEvents       atomic.Int64
+	PendingEvents     atomic.Int64
+	ProcessingEvents  atomic.Int64
+	CompletedEvents   atomic.Int64
+	FailedEvents      atomic.Int64
+	EventsPublished   atomic.Int64
+	EventsConsumed    atomic.Int64
+	ActiveSubscribers atomic.Int32
+	Evictions         atomic.Int64
+}
+
+// MemoryProviderOptions configures the memory provider
+type MemoryProviderOptions struct {
+	InstanceID      string
+	MaxEvents       int
+	CleanupInterval time.Duration
+	MaxAge          time.Duration
+}
+
+// NewMemoryProvider creates a new in-memory event provider
+func NewMemoryProvider(opts MemoryProviderOptions) *MemoryProvider {
+	if opts.MaxEvents == 0 {
+		opts.MaxEvents = 10000 // Default
+	}
+	if opts.CleanupInterval == 0 {
+		opts.CleanupInterval = 5 * time.Minute // Default
+	}
+	if opts.MaxAge == 0 {
+		opts.MaxAge = 24 * time.Hour // Default: keep events for 24 hours
+	}
+
+	mp := &MemoryProvider{
+		events:          make(map[string]*Event),
+		eventOrder:      make([]string, 0),
+		subscribers:     make(map[string][]chan *Event),
+		instanceID:      opts.InstanceID,
+		maxEvents:       opts.MaxEvents,
+		cleanupInterval: opts.CleanupInterval,
+		maxAge:          opts.MaxAge,
+		stopCleanup:     make(chan struct{}),
+	}
+
+	mp.isRunning.Store(true)
+
+	// Start cleanup goroutine
+	mp.wg.Add(1)
+	go mp.cleanupLoop()
+
+	logger.Info("Memory provider initialized (max_events: %d, cleanup: %v, max_age: %v)",
+		opts.MaxEvents, opts.CleanupInterval, opts.MaxAge)
+
+	return mp
+}
+
+// Store stores an event
+func (mp *MemoryProvider) Store(ctx context.Context, event *Event) error {
+	mp.mu.Lock()
+	defer mp.mu.Unlock()
+
+	// Check if we need to evict oldest events
+	if len(mp.events) >= mp.maxEvents {
+		mp.evictOldestLocked()
+	}
+
+	// Store event
+	mp.events[event.ID] = event.Clone()
+	mp.eventOrder = append(mp.eventOrder, event.ID)
+
+	// Update statistics
+	mp.stats.TotalEvents.Add(1)
+	mp.updateStatusCountsLocked(event.Status, 1)
+
+	return nil
+}
+
+// Get retrieves an event by ID
+func (mp *MemoryProvider) Get(ctx context.Context, id string) (*Event, error) {
+	mp.mu.RLock()
+	defer mp.mu.RUnlock()
+
+	event, exists := mp.events[id]
+	if !exists {
+		return nil, fmt.Errorf("event not found: %s", id)
+	}
+
+	return event.Clone(), nil
+}
+
+// List lists events with optional filters
+func (mp *MemoryProvider) List(ctx context.Context, filter *EventFilter) ([]*Event, error) {
+	mp.mu.RLock()
+	defer mp.mu.RUnlock()
+
+	var results []*Event
+
+	for _, event := range mp.events {
+		if mp.matchesFilter(event, filter) {
+			results = append(results, event.Clone())
+		}
+	}
+
+	// Apply limit and offset
+	if filter != nil {
+		if filter.Offset > 0 && filter.Offset < len(results) {
+			results = results[filter.Offset:]
+		}
+		if filter.Limit > 0 && filter.Limit < len(results) {
+			results = results[:filter.Limit]
+		}
+	}
+
+	return results, nil
+}
+
+// UpdateStatus updates the status of an event
+func (mp *MemoryProvider) UpdateStatus(ctx context.Context, id string, status EventStatus, errorMsg string) error {
+	mp.mu.Lock()
+	defer mp.mu.Unlock()
+
+	event, exists := mp.events[id]
+	if !exists {
+		return fmt.Errorf("event not found: %s", id)
+	}
+
+	// Update status counts
+	mp.updateStatusCountsLocked(event.Status, -1)
+	mp.updateStatusCountsLocked(status, 1)
+
+	// Update event
+	event.Status = status
+	if errorMsg != "" {
+		event.Error = errorMsg
+	}
+
+	return nil
+}
+
+// Delete deletes an event by ID
+func (mp *MemoryProvider) Delete(ctx context.Context, id string) error {
+	mp.mu.Lock()
+	defer mp.mu.Unlock()
+
+	event, exists := mp.events[id]
+	if !exists {
+		return fmt.Errorf("event not found: %s", id)
+	}
+
+	// Update counts
+	mp.stats.TotalEvents.Add(-1)
+	mp.updateStatusCountsLocked(event.Status, -1)
+
+	// Delete event
+	delete(mp.events, id)
+
+	// Remove from order tracking
+	for i, eid := range mp.eventOrder {
+		if eid == id {
+			mp.eventOrder = append(mp.eventOrder[:i], mp.eventOrder[i+1:]...)
+			break
+		}
+	}
+
+	return nil
+}
+
+// Stream returns a channel of events for real-time consumption
+// Note: This is in-process only, not cross-instance
+func (mp *MemoryProvider) Stream(ctx context.Context, pattern string) (<-chan *Event, error) {
+	mp.mu.Lock()
+	defer mp.mu.Unlock()
+
+	// Create buffered channel for events
+	ch := make(chan *Event, 100)
+
+	// Store subscriber
+	mp.subscribers[pattern] = append(mp.subscribers[pattern], ch)
+	mp.stats.ActiveSubscribers.Add(1)
+
+	// Goroutine to clean up on context cancellation
+	mp.wg.Add(1)
+	go func() {
+		defer mp.wg.Done()
+		<-ctx.Done()
+
+		mp.mu.Lock()
+		defer mp.mu.Unlock()
+
+		// Remove subscriber
+		subs := mp.subscribers[pattern]
+		for i, subCh := range subs {
+			if subCh == ch {
+				mp.subscribers[pattern] = append(subs[:i], subs[i+1:]...)
+				break
+			}
+		}
+
+		mp.stats.ActiveSubscribers.Add(-1)
+		close(ch)
+	}()
+
+	logger.Debug("Stream created for pattern: %s", pattern)
+	return ch, nil
+}
+
+// Publish publishes an event to all subscribers
+func (mp *MemoryProvider) Publish(ctx context.Context, event *Event) error {
+	// Store the event first
+	if err := mp.Store(ctx, event); err != nil {
+		return err
+	}
+
+	mp.stats.EventsPublished.Add(1)
+
+	// Notify subscribers
+	mp.mu.RLock()
+	defer mp.mu.RUnlock()
+
+	for pattern, channels := range mp.subscribers {
+		if matchPattern(pattern, event.Type) {
+			for _, ch := range channels {
+				select {
+				case ch <- event.Clone():
+					mp.stats.EventsConsumed.Add(1)
+				default:
+					// Channel full, skip
+					logger.Warn("Subscriber channel full for pattern: %s", pattern)
+				}
+			}
+		}
+	}
+
+	return nil
+}
+
+// Close closes the provider and releases resources
+func (mp *MemoryProvider) Close() error {
+	if !mp.isRunning.Load() {
+		return nil
+	}
+
+	mp.isRunning.Store(false)
+
+	// Stop cleanup loop
+	close(mp.stopCleanup)
+
+	// Wait for goroutines
+	mp.wg.Wait()
+
+	// Close all subscriber channels
+	mp.mu.Lock()
+	for _, channels := range mp.subscribers {
+		for _, ch := range channels {
+			close(ch)
+		}
+	}
+	mp.subscribers = make(map[string][]chan *Event)
+	mp.mu.Unlock()
+
+	logger.Info("Memory provider closed")
+	return nil
+}
+
+// Stats returns provider statistics
+func (mp *MemoryProvider) Stats(ctx context.Context) (*ProviderStats, error) {
+	return &ProviderStats{
+		ProviderType:      "memory",
+		TotalEvents:       mp.stats.TotalEvents.Load(),
+		PendingEvents:     mp.stats.PendingEvents.Load(),
+		ProcessingEvents:  mp.stats.ProcessingEvents.Load(),
+		CompletedEvents:   mp.stats.CompletedEvents.Load(),
+		FailedEvents:      mp.stats.FailedEvents.Load(),
+		EventsPublished:   mp.stats.EventsPublished.Load(),
+		EventsConsumed:    mp.stats.EventsConsumed.Load(),
+		ActiveSubscribers: int(mp.stats.ActiveSubscribers.Load()),
+		ProviderSpecific: map[string]interface{}{
+			"max_events":       mp.maxEvents,
+			"cleanup_interval": mp.cleanupInterval.String(),
+			"max_age":          mp.maxAge.String(),
+			"evictions":        mp.stats.Evictions.Load(),
+		},
+	}, nil
+}
+
+// cleanupLoop periodically cleans up old completed events
+func (mp *MemoryProvider) cleanupLoop() {
+	defer mp.wg.Done()
+
+	ticker := time.NewTicker(mp.cleanupInterval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			mp.cleanup()
+		case <-mp.stopCleanup:
+			return
+		}
+	}
+}
+
+// cleanup removes old completed/failed events
+func (mp *MemoryProvider) cleanup() {
+	mp.mu.Lock()
+	defer mp.mu.Unlock()
+
+	cutoff := time.Now().Add(-mp.maxAge)
+	removed := 0
+
+	for id, event := range mp.events {
+		// Only clean up completed or failed events that are old
+		if (event.Status == EventStatusCompleted || event.Status == EventStatusFailed) &&
+			event.CreatedAt.Before(cutoff) {
+
+			delete(mp.events, id)
+			mp.stats.TotalEvents.Add(-1)
+			mp.updateStatusCountsLocked(event.Status, -1)
+
+			// Remove from order tracking
+			for i, eid := range mp.eventOrder {
+				if eid == id {
+					mp.eventOrder = append(mp.eventOrder[:i], mp.eventOrder[i+1:]...)
+					break
+				}
+			}
+
+			removed++
+		}
+	}
+
+	if removed > 0 {
+		logger.Debug("Cleanup removed %d old events", removed)
+	}
+}
+
+// evictOldestLocked evicts the oldest event (LRU)
+// Caller must hold write lock
+func (mp *MemoryProvider) evictOldestLocked() {
+	if len(mp.eventOrder) == 0 {
+		return
+	}
+
+	// Get oldest event ID
+	oldestID := mp.eventOrder[0]
+	mp.eventOrder = mp.eventOrder[1:]
+
+	// Remove event
+	if event, exists := mp.events[oldestID]; exists {
+		delete(mp.events, oldestID)
+		mp.stats.TotalEvents.Add(-1)
+		mp.updateStatusCountsLocked(event.Status, -1)
+		mp.stats.Evictions.Add(1)
+
+		logger.Debug("Evicted oldest event: %s", oldestID)
+	}
+}
+
+// matchesFilter checks if an event matches the filter criteria
+func (mp *MemoryProvider) matchesFilter(event *Event, filter *EventFilter) bool {
+	if filter == nil {
+		return true
+	}
+
+	if filter.Source != nil && event.Source != *filter.Source {
+		return false
+	}
+	if filter.Status != nil && event.Status != *filter.Status {
+		return false
+	}
+	if filter.UserID != nil && event.UserID != *filter.UserID {
+		return false
+	}
+	if filter.Schema != "" && event.Schema != filter.Schema {
+		return false
+	}
+	if filter.Entity != "" && event.Entity != filter.Entity {
+		return false
+	}
+	if filter.Operation != "" && event.Operation != filter.Operation {
+		return false
+	}
+	if filter.InstanceID != "" && event.InstanceID != filter.InstanceID {
+		return false
+	}
+	if filter.StartTime != nil && event.CreatedAt.Before(*filter.StartTime) {
+		return false
+	}
+	if filter.EndTime != nil && event.CreatedAt.After(*filter.EndTime) {
+		return false
+	}
+
+	return true
+}
+
+// updateStatusCountsLocked updates status statistics
+// Caller must hold write lock
+func (mp *MemoryProvider) updateStatusCountsLocked(status EventStatus, delta int64) {
+	switch status {
+	case EventStatusPending:
+		mp.stats.PendingEvents.Add(delta)
+	case EventStatusProcessing:
+		mp.stats.ProcessingEvents.Add(delta)
+	case EventStatusCompleted:
+		mp.stats.CompletedEvents.Add(delta)
+	case EventStatusFailed:
+		mp.stats.FailedEvents.Add(delta)
+	}
+}

pkg/eventbroker/provider_memory_test.go

@@ -0,0 +1,419 @@
+package eventbroker
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+func TestNewMemoryProvider(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID:      "test-instance",
+		MaxEvents:       100,
+		CleanupInterval: 1 * time.Minute,
+	})
+
+	if provider == nil {
+		t.Fatal("Expected non-nil provider")
+	}
+
+	stats, err := provider.Stats(context.Background())
+	if err != nil {
+		t.Fatalf("Stats failed: %v", err)
+	}
+
+	if stats.ProviderType != "memory" {
+		t.Errorf("Expected provider type 'memory', got %s", stats.ProviderType)
+	}
+}
+
+func TestMemoryProviderPublishAndGet(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	event.UserID = 123
+
+	// Publish event
+	if err := provider.Publish(context.Background(), event); err != nil {
+		t.Fatalf("Publish failed: %v", err)
+	}
+
+	// Get event
+	retrieved, err := provider.Get(context.Background(), event.ID)
+	if err != nil {
+		t.Fatalf("Get failed: %v", err)
+	}
+
+	if retrieved.ID != event.ID {
+		t.Errorf("Expected event ID %s, got %s", event.ID, retrieved.ID)
+	}
+	if retrieved.UserID != 123 {
+		t.Errorf("Expected user ID 123, got %d", retrieved.UserID)
+	}
+}
+
+func TestMemoryProviderGetNonExistent(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	_, err := provider.Get(context.Background(), "non-existent-id")
+	if err == nil {
+		t.Error("Expected error when getting non-existent event")
+	}
+}
+
+func TestMemoryProviderUpdateStatus(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	provider.Publish(context.Background(), event)
+
+	// Update status to processing
+	err := provider.UpdateStatus(context.Background(), event.ID, EventStatusProcessing, "")
+	if err != nil {
+		t.Fatalf("UpdateStatus failed: %v", err)
+	}
+
+	retrieved, _ := provider.Get(context.Background(), event.ID)
+	if retrieved.Status != EventStatusProcessing {
+		t.Errorf("Expected status %s, got %s", EventStatusProcessing, retrieved.Status)
+	}
+
+	// Update status to failed with error
+	err = provider.UpdateStatus(context.Background(), event.ID, EventStatusFailed, "test error")
+	if err != nil {
+		t.Fatalf("UpdateStatus failed: %v", err)
+	}
+
+	retrieved, _ = provider.Get(context.Background(), event.ID)
+	if retrieved.Status != EventStatusFailed {
+		t.Errorf("Expected status %s, got %s", EventStatusFailed, retrieved.Status)
+	}
+	if retrieved.Error != "test error" {
+		t.Errorf("Expected error 'test error', got %s", retrieved.Error)
+	}
+}
+
+func TestMemoryProviderList(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	// Publish multiple events
+	for i := 0; i < 5; i++ {
+		event := NewEvent(EventSourceDatabase, "public.users.create")
+		provider.Publish(context.Background(), event)
+	}
+
+	// List all events
+	events, err := provider.List(context.Background(), &EventFilter{})
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+
+	if len(events) != 5 {
+		t.Errorf("Expected 5 events, got %d", len(events))
+	}
+}
+
+func TestMemoryProviderListWithFilter(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	// Publish events with different types
+	event1 := NewEvent(EventSourceDatabase, "public.users.create")
+	provider.Publish(context.Background(), event1)
+
+	event2 := NewEvent(EventSourceDatabase, "public.roles.create")
+	provider.Publish(context.Background(), event2)
+
+	event3 := NewEvent(EventSourceWebSocket, "chat.message")
+	provider.Publish(context.Background(), event3)
+
+	// Filter by source
+	source := EventSourceDatabase
+	events, err := provider.List(context.Background(), &EventFilter{
+		Source: &source,
+	})
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+
+	if len(events) != 2 {
+		t.Errorf("Expected 2 events with database source, got %d", len(events))
+	}
+
+	// Filter by status
+	status := EventStatusPending
+	events, err = provider.List(context.Background(), &EventFilter{
+		Status: &status,
+	})
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+
+	if len(events) != 3 {
+		t.Errorf("Expected 3 events with pending status, got %d", len(events))
+	}
+}
+
+func TestMemoryProviderListWithLimit(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	// Publish multiple events
+	for i := 0; i < 10; i++ {
+		event := NewEvent(EventSourceDatabase, "test.event")
+		provider.Publish(context.Background(), event)
+	}
+
+	// List with limit
+	events, err := provider.List(context.Background(), &EventFilter{
+		Limit: 5,
+	})
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+
+	if len(events) != 5 {
+		t.Errorf("Expected 5 events (limited), got %d", len(events))
+	}
+}
+
+func TestMemoryProviderDelete(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	provider.Publish(context.Background(), event)
+
+	// Delete event
+	err := provider.Delete(context.Background(), event.ID)
+	if err != nil {
+		t.Fatalf("Delete failed: %v", err)
+	}
+
+	// Verify deleted
+	_, err = provider.Get(context.Background(), event.ID)
+	if err == nil {
+		t.Error("Expected error when getting deleted event")
+	}
+}
+
+func TestMemoryProviderLRUEviction(t *testing.T) {
+	// Create provider with small max events
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+		MaxEvents:  3,
+	})
+
+	// Publish 5 events
+	events := make([]*Event, 5)
+	for i := 0; i < 5; i++ {
+		events[i] = NewEvent(EventSourceDatabase, "test.event")
+		provider.Publish(context.Background(), events[i])
+	}
+
+	// First 2 events should be evicted
+	_, err := provider.Get(context.Background(), events[0].ID)
+	if err == nil {
+		t.Error("Expected first event to be evicted")
+	}
+
+	_, err = provider.Get(context.Background(), events[1].ID)
+	if err == nil {
+		t.Error("Expected second event to be evicted")
+	}
+
+	// Last 3 events should still exist
+	for i := 2; i < 5; i++ {
+		_, err := provider.Get(context.Background(), events[i].ID)
+		if err != nil {
+			t.Errorf("Expected event %d to still exist", i)
+		}
+	}
+}
+
+func TestMemoryProviderCleanup(t *testing.T) {
+	// Create provider with short cleanup interval
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID:      "test-instance",
+		CleanupInterval: 100 * time.Millisecond,
+		MaxAge:          200 * time.Millisecond,
+	})
+
+	// Publish and complete an event
+	event := NewEvent(EventSourceDatabase, "test.event")
+	provider.Publish(context.Background(), event)
+	provider.UpdateStatus(context.Background(), event.ID, EventStatusCompleted, "")
+
+	// Wait for cleanup to run
+	time.Sleep(400 * time.Millisecond)
+
+	// Event should be cleaned up
+	_, err := provider.Get(context.Background(), event.ID)
+	if err == nil {
+		t.Error("Expected event to be cleaned up")
+	}
+
+	provider.Close()
+}
+
+func TestMemoryProviderStats(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+		MaxEvents:  100,
+	})
+
+	// Publish events
+	for i := 0; i < 5; i++ {
+		event := NewEvent(EventSourceDatabase, "test.event")
+		provider.Publish(context.Background(), event)
+	}
+
+	stats, err := provider.Stats(context.Background())
+	if err != nil {
+		t.Fatalf("Stats failed: %v", err)
+	}
+
+	if stats.ProviderType != "memory" {
+		t.Errorf("Expected provider type 'memory', got %s", stats.ProviderType)
+	}
+	if stats.TotalEvents != 5 {
+		t.Errorf("Expected 5 total events, got %d", stats.TotalEvents)
+	}
+}
+
+func TestMemoryProviderClose(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID:      "test-instance",
+		CleanupInterval: 100 * time.Millisecond,
+	})
+
+	// Publish event
+	event := NewEvent(EventSourceDatabase, "test.event")
+	provider.Publish(context.Background(), event)
+
+	// Close provider
+	err := provider.Close()
+	if err != nil {
+		t.Fatalf("Close failed: %v", err)
+	}
+
+	// Cleanup goroutine should be stopped
+	time.Sleep(200 * time.Millisecond)
+}
+
+func TestMemoryProviderConcurrency(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	// Concurrent publish
+	done := make(chan bool, 10)
+	for i := 0; i < 10; i++ {
+		go func() {
+			defer func() { done <- true }()
+			event := NewEvent(EventSourceDatabase, "test.event")
+			provider.Publish(context.Background(), event)
+		}()
+	}
+
+	// Wait for all goroutines
+	for i := 0; i < 10; i++ {
+		<-done
+	}
+
+	// Verify all events were stored
+	events, _ := provider.List(context.Background(), &EventFilter{})
+	if len(events) != 10 {
+		t.Errorf("Expected 10 events, got %d", len(events))
+	}
+}
+
+func TestMemoryProviderStream(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	// Stream is implemented for memory provider (in-process pub/sub)
+	ch, err := provider.Stream(context.Background(), "test.*")
+	if err != nil {
+		t.Fatalf("Stream failed: %v", err)
+	}
+	if ch == nil {
+		t.Error("Expected non-nil channel")
+	}
+}
+
+func TestMemoryProviderTimeRangeFilter(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	// Publish events at different times
+	event1 := NewEvent(EventSourceDatabase, "test.event")
+	provider.Publish(context.Background(), event1)
+
+	time.Sleep(10 * time.Millisecond)
+
+	event2 := NewEvent(EventSourceDatabase, "test.event")
+	provider.Publish(context.Background(), event2)
+
+	time.Sleep(10 * time.Millisecond)
+
+	event3 := NewEvent(EventSourceDatabase, "test.event")
+	provider.Publish(context.Background(), event3)
+
+	// Filter by time range
+	startTime := event2.CreatedAt.Add(-1 * time.Millisecond)
+	events, err := provider.List(context.Background(), &EventFilter{
+		StartTime: &startTime,
+	})
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+
+	// Should get events 2 and 3
+	if len(events) != 2 {
+		t.Errorf("Expected 2 events after start time, got %d", len(events))
+	}
+}
+
+func TestMemoryProviderInstanceIDFilter(t *testing.T) {
+	provider := NewMemoryProvider(MemoryProviderOptions{
+		InstanceID: "test-instance",
+	})
+
+	// Publish events with different instance IDs
+	event1 := NewEvent(EventSourceDatabase, "test.event")
+	event1.InstanceID = "instance-1"
+	provider.Publish(context.Background(), event1)
+
+	event2 := NewEvent(EventSourceDatabase, "test.event")
+	event2.InstanceID = "instance-2"
+	provider.Publish(context.Background(), event2)
+
+	// Filter by instance ID
+	events, err := provider.List(context.Background(), &EventFilter{
+		InstanceID: "instance-1",
+	})
+	if err != nil {
+		t.Fatalf("List failed: %v", err)
+	}
+
+	if len(events) != 1 {
+		t.Errorf("Expected 1 event with instance-1, got %d", len(events))
+	}
+	if events[0].InstanceID != "instance-1" {
+		t.Errorf("Expected instance ID 'instance-1', got %s", events[0].InstanceID)
+	}
+}

pkg/eventbroker/subscription.go

@@ -0,0 +1,140 @@
+package eventbroker
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+	"sync/atomic"
+
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
+)
+
+// SubscriptionID uniquely identifies a subscription
+type SubscriptionID string
+
+// subscription represents a single subscription with its handler and pattern
+type subscription struct {
+	id      SubscriptionID
+	pattern string
+	handler EventHandler
+}
+
+// subscriptionManager manages event subscriptions and pattern matching
+type subscriptionManager struct {
+	mu            sync.RWMutex
+	subscriptions map[SubscriptionID]*subscription
+	nextID        atomic.Uint64
+}
+
+// newSubscriptionManager creates a new subscription manager
+func newSubscriptionManager() *subscriptionManager {
+	return &subscriptionManager{
+		subscriptions: make(map[SubscriptionID]*subscription),
+	}
+}
+
+// Subscribe adds a new subscription
+func (sm *subscriptionManager) Subscribe(pattern string, handler EventHandler) (SubscriptionID, error) {
+	if pattern == "" {
+		return "", fmt.Errorf("pattern cannot be empty")
+	}
+	if handler == nil {
+		return "", fmt.Errorf("handler cannot be nil")
+	}
+
+	id := SubscriptionID(fmt.Sprintf("sub-%d", sm.nextID.Add(1)))
+
+	sm.mu.Lock()
+	sm.subscriptions[id] = &subscription{
+		id:      id,
+		pattern: pattern,
+		handler: handler,
+	}
+	sm.mu.Unlock()
+
+	logger.Info("Subscribed to pattern '%s' with ID: %s", pattern, id)
+	return id, nil
+}
+
+// Unsubscribe removes a subscription
+func (sm *subscriptionManager) Unsubscribe(id SubscriptionID) error {
+	sm.mu.Lock()
+	defer sm.mu.Unlock()
+
+	if _, exists := sm.subscriptions[id]; !exists {
+		return fmt.Errorf("subscription not found: %s", id)
+	}
+
+	delete(sm.subscriptions, id)
+	logger.Info("Unsubscribed: %s", id)
+	return nil
+}
+
+// GetMatching returns all handlers that match the event type
+func (sm *subscriptionManager) GetMatching(eventType string) []EventHandler {
+	sm.mu.RLock()
+	defer sm.mu.RUnlock()
+
+	var handlers []EventHandler
+	for _, sub := range sm.subscriptions {
+		if matchPattern(sub.pattern, eventType) {
+			handlers = append(handlers, sub.handler)
+		}
+	}
+
+	return handlers
+}
+
+// Count returns the number of active subscriptions
+func (sm *subscriptionManager) Count() int {
+	sm.mu.RLock()
+	defer sm.mu.RUnlock()
+	return len(sm.subscriptions)
+}
+
+// Clear removes all subscriptions
+func (sm *subscriptionManager) Clear() {
+	sm.mu.Lock()
+	defer sm.mu.Unlock()
+	sm.subscriptions = make(map[SubscriptionID]*subscription)
+	logger.Info("Cleared all subscriptions")
+}
+
+// matchPattern implements glob-style pattern matching for event types
+// Patterns:
+//   - "*" matches any single segment
+//   - "a.b.c" matches exactly "a.b.c"
+//   - "a.*.c" matches "a.anything.c"
+//   - "a.b.*" matches any operation on a.b
+//   - "*" matches everything
+//
+// Event type format: schema.entity.operation (e.g., "public.users.create")
+func matchPattern(pattern, eventType string) bool {
+	// Wildcard matches everything
+	if pattern == "*" {
+		return true
+	}
+
+	// Exact match
+	if pattern == eventType {
+		return true
+	}
+
+	// Split pattern and event type by dots
+	patternParts := strings.Split(pattern, ".")
+	eventParts := strings.Split(eventType, ".")
+
+	// Different number of parts can only match if pattern has wildcards
+	if len(patternParts) != len(eventParts) {
+		return false
+	}
+
+	// Match each part
+	for i := range patternParts {
+		if patternParts[i] != "*" && patternParts[i] != eventParts[i] {
+			return false
+		}
+	}
+
+	return true
+}

pkg/eventbroker/subscription_test.go

@@ -0,0 +1,270 @@
+package eventbroker
+
+import (
+	"context"
+	"testing"
+)
+
+func TestMatchPattern(t *testing.T) {
+	tests := []struct {
+		pattern   string
+		eventType string
+		expected  bool
+	}{
+		// Exact matches
+		{"public.users.create", "public.users.create", true},
+		{"public.users.create", "public.users.update", false},
+
+		// Wildcard matches
+		{"*", "public.users.create", true},
+		{"*", "anything", true},
+		{"public.*", "public.users", true},
+		{"public.*", "public.users.create", false}, // Different number of parts
+		{"public.*", "admin.users", false},
+		{"*.users.create", "public.users.create", true},
+		{"*.users.create", "admin.users.create", true},
+		{"*.users.create", "public.roles.create", false},
+		{"public.*.create", "public.users.create", true},
+		{"public.*.create", "public.roles.create", true},
+		{"public.*.create", "public.users.update", false},
+
+		// Multiple wildcards
+		{"*.*", "public.users", true},
+		{"*.*", "public.users.create", false}, // Different number of parts
+		{"*.*.create", "public.users.create", true},
+		{"*.*.create", "admin.roles.create", true},
+		{"*.*.create", "public.users.update", false},
+
+		// Edge cases
+		{"", "", true},
+		{"", "something", false},
+		{"something", "", false},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.pattern+"_vs_"+tt.eventType, func(t *testing.T) {
+			result := matchPattern(tt.pattern, tt.eventType)
+			if result != tt.expected {
+				t.Errorf("matchPattern(%q, %q) = %v, expected %v",
+					tt.pattern, tt.eventType, result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestSubscriptionManager(t *testing.T) {
+	manager := newSubscriptionManager()
+
+	// Create test handler
+	called := false
+	handler := EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		called = true
+		return nil
+	})
+
+	// Test Subscribe
+	id, err := manager.Subscribe("public.users.*", handler)
+	if err != nil {
+		t.Fatalf("Subscribe failed: %v", err)
+	}
+	if id == "" {
+		t.Fatal("Expected non-empty subscription ID")
+	}
+
+	// Test GetMatching
+	handlers := manager.GetMatching("public.users.create")
+	if len(handlers) != 1 {
+		t.Fatalf("Expected 1 handler, got %d", len(handlers))
+	}
+
+	// Test handler execution
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	if err := handlers[0].Handle(context.Background(), event); err != nil {
+		t.Fatalf("Handler execution failed: %v", err)
+	}
+	if !called {
+		t.Error("Expected handler to be called")
+	}
+
+	// Test Count
+	if manager.Count() != 1 {
+		t.Errorf("Expected count 1, got %d", manager.Count())
+	}
+
+	// Test Unsubscribe
+	if err := manager.Unsubscribe(id); err != nil {
+		t.Fatalf("Unsubscribe failed: %v", err)
+	}
+
+	// Verify unsubscribed
+	handlers = manager.GetMatching("public.users.create")
+	if len(handlers) != 0 {
+		t.Errorf("Expected 0 handlers after unsubscribe, got %d", len(handlers))
+	}
+	if manager.Count() != 0 {
+		t.Errorf("Expected count 0 after unsubscribe, got %d", manager.Count())
+	}
+}
+
+func TestSubscriptionManagerMultipleHandlers(t *testing.T) {
+	manager := newSubscriptionManager()
+
+	called1 := false
+	handler1 := EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		called1 = true
+		return nil
+	})
+
+	called2 := false
+	handler2 := EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		called2 = true
+		return nil
+	})
+
+	// Subscribe multiple handlers
+	id1, _ := manager.Subscribe("public.users.*", handler1)
+	id2, _ := manager.Subscribe("*.users.*", handler2)
+
+	// Both should match
+	handlers := manager.GetMatching("public.users.create")
+	if len(handlers) != 2 {
+		t.Fatalf("Expected 2 handlers, got %d", len(handlers))
+	}
+
+	// Execute all handlers
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	for _, h := range handlers {
+		h.Handle(context.Background(), event)
+	}
+
+	if !called1 || !called2 {
+		t.Error("Expected both handlers to be called")
+	}
+
+	// Unsubscribe one
+	manager.Unsubscribe(id1)
+	handlers = manager.GetMatching("public.users.create")
+	if len(handlers) != 1 {
+		t.Errorf("Expected 1 handler after unsubscribe, got %d", len(handlers))
+	}
+
+	// Unsubscribe remaining
+	manager.Unsubscribe(id2)
+	if manager.Count() != 0 {
+		t.Errorf("Expected count 0 after all unsubscribe, got %d", manager.Count())
+	}
+}
+
+func TestSubscriptionManagerConcurrency(t *testing.T) {
+	manager := newSubscriptionManager()
+
+	handler := EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		return nil
+	})
+
+	// Subscribe and unsubscribe concurrently
+	done := make(chan bool, 10)
+	for i := 0; i < 10; i++ {
+		go func() {
+			defer func() { done <- true }()
+			id, _ := manager.Subscribe("test.*", handler)
+			manager.GetMatching("test.event")
+			manager.Unsubscribe(id)
+		}()
+	}
+
+	// Wait for all goroutines
+	for i := 0; i < 10; i++ {
+		<-done
+	}
+
+	// Should have no subscriptions left
+	if manager.Count() != 0 {
+		t.Errorf("Expected count 0 after concurrent operations, got %d", manager.Count())
+	}
+}
+
+func TestSubscriptionManagerUnsubscribeNonExistent(t *testing.T) {
+	manager := newSubscriptionManager()
+
+	// Try to unsubscribe a non-existent ID
+	err := manager.Unsubscribe("non-existent-id")
+	if err == nil {
+		t.Error("Expected error when unsubscribing non-existent ID")
+	}
+}
+
+func TestSubscriptionIDGeneration(t *testing.T) {
+	manager := newSubscriptionManager()
+
+	handler := EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		return nil
+	})
+
+	// Subscribe multiple times and ensure unique IDs
+	ids := make(map[SubscriptionID]bool)
+	for i := 0; i < 100; i++ {
+		id, _ := manager.Subscribe("test.*", handler)
+		if ids[id] {
+			t.Fatalf("Duplicate subscription ID: %s", id)
+		}
+		ids[id] = true
+	}
+}
+
+func TestEventHandlerFunc(t *testing.T) {
+	called := false
+	var receivedEvent *Event
+
+	handler := EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		called = true
+		receivedEvent = event
+		return nil
+	})
+
+	event := NewEvent(EventSourceDatabase, "test.event")
+	err := handler.Handle(context.Background(), event)
+
+	if err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+	if !called {
+		t.Error("Expected handler to be called")
+	}
+	if receivedEvent != event {
+		t.Error("Expected to receive the same event")
+	}
+}
+
+func TestSubscriptionManagerPatternPriority(t *testing.T) {
+	manager := newSubscriptionManager()
+
+	// More specific patterns should still match
+	specificCalled := false
+	genericCalled := false
+
+	manager.Subscribe("public.users.create", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		specificCalled = true
+		return nil
+	}))
+
+	manager.Subscribe("*", EventHandlerFunc(func(ctx context.Context, event *Event) error {
+		genericCalled = true
+		return nil
+	}))
+
+	handlers := manager.GetMatching("public.users.create")
+	if len(handlers) != 2 {
+		t.Fatalf("Expected 2 matching handlers, got %d", len(handlers))
+	}
+
+	// Execute all handlers
+	event := NewEvent(EventSourceDatabase, "public.users.create")
+	for _, h := range handlers {
+		h.Handle(context.Background(), event)
+	}
+
+	if !specificCalled || !genericCalled {
+		t.Error("Expected both specific and generic handlers to be called")
+	}
+}

pkg/eventbroker/worker_pool.go

@@ -0,0 +1,141 @@
+package eventbroker
+
+import (
+	"context"
+	"sync"
+	"sync/atomic"
+
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
+)
+
+// workerPool manages a pool of workers for async event processing
+type workerPool struct {
+	workerCount int
+	bufferSize  int
+	eventQueue  chan *Event
+	processor   func(context.Context, *Event) error
+
+	activeWorkers atomic.Int32
+	isRunning     atomic.Bool
+	stopCh        chan struct{}
+	wg            sync.WaitGroup
+}
+
+// newWorkerPool creates a new worker pool
+func newWorkerPool(workerCount, bufferSize int, processor func(context.Context, *Event) error) *workerPool {
+	return &workerPool{
+		workerCount: workerCount,
+		bufferSize:  bufferSize,
+		eventQueue:  make(chan *Event, bufferSize),
+		processor:   processor,
+		stopCh:      make(chan struct{}),
+	}
+}
+
+// Start starts the worker pool
+func (wp *workerPool) Start() {
+	if wp.isRunning.Load() {
+		return
+	}
+
+	wp.isRunning.Store(true)
+
+	// Start workers
+	for i := 0; i < wp.workerCount; i++ {
+		wp.wg.Add(1)
+		go wp.worker(i)
+	}
+
+	logger.Info("Worker pool started with %d workers", wp.workerCount)
+}
+
+// Stop stops the worker pool gracefully
+func (wp *workerPool) Stop(ctx context.Context) error {
+	if !wp.isRunning.Load() {
+		return nil
+	}
+
+	wp.isRunning.Store(false)
+
+	// Close event queue to signal workers
+	close(wp.eventQueue)
+
+	// Wait for workers to finish with context timeout
+	done := make(chan struct{})
+	go func() {
+		wp.wg.Wait()
+		close(done)
+	}()
+
+	select {
+	case <-done:
+		logger.Info("Worker pool stopped gracefully")
+		return nil
+	case <-ctx.Done():
+		logger.Warn("Worker pool stop timed out, some events may be lost")
+		return ctx.Err()
+	}
+}
+
+// Submit submits an event to the queue
+func (wp *workerPool) Submit(ctx context.Context, event *Event) error {
+	if !wp.isRunning.Load() {
+		return ErrWorkerPoolStopped
+	}
+
+	select {
+	case wp.eventQueue <- event:
+		return nil
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+		return ErrQueueFull
+	}
+}
+
+// worker is a worker goroutine that processes events from the queue
+func (wp *workerPool) worker(id int) {
+	defer wp.wg.Done()
+
+	logger.Debug("Worker %d started", id)
+
+	for event := range wp.eventQueue {
+		wp.activeWorkers.Add(1)
+
+		// Process event with background context (detached from original request)
+		ctx := context.Background()
+		if err := wp.processor(ctx, event); err != nil {
+			logger.Error("Worker %d failed to process event %s: %v", id, event.ID, err)
+		}
+
+		wp.activeWorkers.Add(-1)
+	}
+
+	logger.Debug("Worker %d stopped", id)
+}
+
+// QueueSize returns the current queue size
+func (wp *workerPool) QueueSize() int {
+	return len(wp.eventQueue)
+}
+
+// ActiveWorkers returns the number of currently active workers
+func (wp *workerPool) ActiveWorkers() int {
+	return int(wp.activeWorkers.Load())
+}
+
+// Error definitions
+var (
+	ErrWorkerPoolStopped = &BrokerError{Code: "worker_pool_stopped", Message: "worker pool is stopped"}
+	ErrQueueFull         = &BrokerError{Code: "queue_full", Message: "event queue is full"}
+)
+
+// BrokerError represents an error from the event broker
+type BrokerError struct {
+	Code    string
+	Message string
+}
+
+func (e *BrokerError) Error() string {
+	return e.Message
+}

pkg/funcspec/function_api.go

@@ -20,8 +20,23 @@ import (
 
 // Handler handles function-based SQL API requests
 type Handler struct {
-	db    common.Database
+	db                common.Database
-	hooks *HookRegistry
+	hooks             *HookRegistry
+	variablesCallback func(r *http.Request) map[string]interface{}
+}
+
+type SqlQueryOptions struct {
+	NoCount     bool
+	BlankParams bool
+	AllowFilter bool
+}
+
+func NewSqlQueryOptions() SqlQueryOptions {
+	return SqlQueryOptions{
+		NoCount:     false,
+		BlankParams: true,
+		AllowFilter: true,
+	}
 }
 
 // NewHandler creates a new function API handler
@@ -38,6 +53,14 @@ func (h *Handler) GetDatabase() common.Database {
 	return h.db
 }
 
+func (h *Handler) SetVariablesCallback(callback func(r *http.Request) map[string]interface{}) {
+	h.variablesCallback = callback
+}
+
+func (h *Handler) GetVariablesCallback() func(r *http.Request) map[string]interface{} {
+	return h.variablesCallback
+}
+
 // Hooks returns the hook registry for this handler
 // Use this to register custom hooks for operations
 func (h *Handler) Hooks() *HookRegistry {
@@ -48,7 +71,7 @@ func (h *Handler) Hooks() *HookRegistry {
 type HTTPFuncType func(http.ResponseWriter, *http.Request)
 
 // SqlQueryList creates an HTTP handler that executes a SQL query and returns a list with pagination
-func (h *Handler) SqlQueryList(sqlquery string, pNoCount, pBlankparms, pAllowFilter bool) HTTPFuncType {
+func (h *Handler) SqlQueryList(sqlquery string, options SqlQueryOptions) HTTPFuncType {
 	return func(w http.ResponseWriter, r *http.Request) {
 		defer func() {
 			if err := recover(); err != nil {
@@ -70,6 +93,7 @@ func (h *Handler) SqlQueryList(sqlquery string, pNoCount, pBlankparms, pAllowFil
 		inputvars := make([]string, 0)
 		metainfo := make(map[string]interface{})
 		variables := make(map[string]interface{})
+
 		complexAPI := false
 
 		// Get user context from security package
@@ -93,9 +117,9 @@ func (h *Handler) SqlQueryList(sqlquery string, pNoCount, pBlankparms, pAllowFil
 			MetaInfo:    metainfo,
 			PropQry:     propQry,
 			UserContext: userCtx,
-			NoCount:     pNoCount,
+			NoCount:     options.NoCount,
-			BlankParams: pBlankparms,
+			BlankParams: options.BlankParams,
-			AllowFilter: pAllowFilter,
+			AllowFilter: options.AllowFilter,
 			ComplexAPI:  complexAPI,
 		}
 
@@ -131,13 +155,13 @@ func (h *Handler) SqlQueryList(sqlquery string, pNoCount, pBlankparms, pAllowFil
 		complexAPI = reqParams.ComplexAPI
 
 		// Merge query string parameters
-		sqlquery = h.mergeQueryParams(r, sqlquery, variables, pAllowFilter, propQry)
+		sqlquery = h.mergeQueryParams(r, sqlquery, variables, options.AllowFilter, propQry)
 
 		// Merge header parameters
 		sqlquery = h.mergeHeaderParams(r, sqlquery, variables, propQry, &complexAPI)
 
 		// Apply filters from parsed parameters (if not already applied by pAllowFilter)
-		if !pAllowFilter {
+		if !options.AllowFilter {
 			sqlquery = h.ApplyFilters(sqlquery, reqParams)
 		}
 
@@ -149,7 +173,7 @@ func (h *Handler) SqlQueryList(sqlquery string, pNoCount, pBlankparms, pAllowFil
 
 		// Override pNoCount if skipcount is specified
 		if reqParams.SkipCount {
-			pNoCount = true
+			options.NoCount = true
 		}
 
 		// Build metainfo
@@ -164,7 +188,7 @@ func (h *Handler) SqlQueryList(sqlquery string, pNoCount, pBlankparms, pAllowFil
 		sqlquery = h.replaceMetaVariables(sqlquery, r, userCtx, metainfo, variables)
 
 		// Remove unused input variables
-		if pBlankparms {
+		if options.BlankParams {
 			for _, kw := range inputvars {
 				replacement := getReplacementForBlankParam(sqlquery, kw)
 				sqlquery = strings.ReplaceAll(sqlquery, kw, replacement)
@@ -205,7 +229,7 @@ func (h *Handler) SqlQueryList(sqlquery string, pNoCount, pBlankparms, pAllowFil
 				sqlquery = fmt.Sprintf("%s \nORDER BY %s", sqlquery, ValidSQL(sortcols, "select"))
 			}
 
-			if !pNoCount {
+			if !options.NoCount {
 				if limit > 0 && offset > 0 {
 					sqlquery = fmt.Sprintf("%s \nLIMIT %d OFFSET %d", sqlquery, limit, offset)
 				} else if limit > 0 {
@@ -244,7 +268,7 @@ func (h *Handler) SqlQueryList(sqlquery string, pNoCount, pBlankparms, pAllowFil
 			// Normalize PostgreSQL types for proper JSON marshaling
 			dbobjlist = normalizePostgresTypesList(rows)
 
-			if pNoCount {
+			if options.NoCount {
 				total = int64(len(dbobjlist))
 			}
 
@@ -386,7 +410,7 @@ func (h *Handler) SqlQueryList(sqlquery string, pNoCount, pBlankparms, pAllowFil
 }
 
 // SqlQuery creates an HTTP handler that executes a SQL query and returns a single record
-func (h *Handler) SqlQuery(sqlquery string, pBlankparms bool) HTTPFuncType {
+func (h *Handler) SqlQuery(sqlquery string, options SqlQueryOptions) HTTPFuncType {
 	return func(w http.ResponseWriter, r *http.Request) {
 		defer func() {
 			if err := recover(); err != nil {
@@ -406,6 +430,7 @@ func (h *Handler) SqlQuery(sqlquery string, pBlankparms bool) HTTPFuncType {
 		inputvars := make([]string, 0)
 		metainfo := make(map[string]interface{})
 		variables := make(map[string]interface{})
+
 		dbobj := make(map[string]interface{})
 		complexAPI := false
 
@@ -430,7 +455,7 @@ func (h *Handler) SqlQuery(sqlquery string, pBlankparms bool) HTTPFuncType {
 			MetaInfo:    metainfo,
 			PropQry:     propQry,
 			UserContext: userCtx,
-			BlankParams: pBlankparms,
+			BlankParams: options.BlankParams,
 			ComplexAPI:  complexAPI,
 		}
 
@@ -507,7 +532,7 @@ func (h *Handler) SqlQuery(sqlquery string, pBlankparms bool) HTTPFuncType {
 		}
 
 		// Remove unused input variables
-		if pBlankparms {
+		if options.BlankParams {
 			for _, kw := range inputvars {
 				replacement := getReplacementForBlankParam(sqlquery, kw)
 				sqlquery = strings.ReplaceAll(sqlquery, kw, replacement)
@@ -631,8 +656,18 @@ func (h *Handler) extractInputVariables(sqlquery string, inputvars *[]string) st
 
 // mergePathParams merges URL path parameters into the SQL query
 func (h *Handler) mergePathParams(r *http.Request, sqlquery string, variables map[string]interface{}) string {
-	// Note: Path parameters would typically come from a router like gorilla/mux
+
-	// For now, this is a placeholder for path parameter extraction
+	if h.GetVariablesCallback() != nil {
+		pathVars := h.GetVariablesCallback()(r)
+		for k, v := range pathVars {
+			kword := fmt.Sprintf("[%s]", k)
+			if strings.Contains(sqlquery, kword) {
+				sqlquery = strings.ReplaceAll(sqlquery, kword, fmt.Sprintf("%v", v))
+			}
+			variables[k] = v
+
+		}
+	}
 	return sqlquery
 }
 

pkg/funcspec/function_api_test.go

@@ -70,6 +70,10 @@ func (m *MockDatabase) RunInTransaction(ctx context.Context, fn func(common.Data
 	return fn(m)
 }
 
+func (m *MockDatabase) GetUnderlyingDB() interface{} {
+	return m
+}
+
 // MockResult implements common.Result interface for testing
 type MockResult struct {
 	rows int64
@@ -532,7 +536,7 @@ func TestSqlQuery(t *testing.T) {
 			req := createTestRequest("GET", "/test", tt.queryParams, tt.headers, nil)
 			w := httptest.NewRecorder()
 
-			handlerFunc := handler.SqlQuery(tt.sqlQuery, tt.blankParams)
+			handlerFunc := handler.SqlQuery(tt.sqlQuery, SqlQueryOptions{BlankParams: tt.blankParams})
 			handlerFunc(w, req)
 
 			if w.Code != tt.expectedStatus {
@@ -655,7 +659,7 @@ func TestSqlQueryList(t *testing.T) {
 			req := createTestRequest("GET", "/test", tt.queryParams, tt.headers, nil)
 			w := httptest.NewRecorder()
 
-			handlerFunc := handler.SqlQueryList(tt.sqlQuery, tt.noCount, tt.blankParams, tt.allowFilter)
+			handlerFunc := handler.SqlQueryList(tt.sqlQuery, SqlQueryOptions{NoCount: tt.noCount, BlankParams: tt.blankParams, AllowFilter: tt.allowFilter})
 			handlerFunc(w, req)
 
 			if w.Code != tt.expectedStatus {

pkg/funcspec/hooks_test.go

@@ -576,7 +576,7 @@ func TestHookIntegrationWithHandler(t *testing.T) {
 	req := createTestRequest("GET", "/test", nil, nil, nil)
 	w := httptest.NewRecorder()
 
-	handlerFunc := handler.SqlQuery("SELECT * FROM users WHERE id = 1", false)
+	handlerFunc := handler.SqlQuery("SELECT * FROM users WHERE id = 1", SqlQueryOptions{})
 	handlerFunc(w, req)
 
 	if !hookCalled {

pkg/metrics/interfaces.go

@@ -30,6 +30,15 @@ type Provider interface {
 	// UpdateCacheSize updates the cache size metric
 	UpdateCacheSize(provider string, size int64)
 
+	// RecordEventPublished records an event publication
+	RecordEventPublished(source, eventType string)
+
+	// RecordEventProcessed records an event processing with its status
+	RecordEventProcessed(source, eventType, status string, duration time.Duration)
+
+	// UpdateEventQueueSize updates the event queue size metric
+	UpdateEventQueueSize(size int64)
+
 	// Handler returns an HTTP handler for exposing metrics (e.g., /metrics endpoint)
 	Handler() http.Handler
 }
@@ -59,9 +68,13 @@ func (n *NoOpProvider) IncRequestsInFlight()
 func (n *NoOpProvider) DecRequestsInFlight()                                                  {}
 func (n *NoOpProvider) RecordDBQuery(operation, table string, duration time.Duration, err error) {
 }
-func (n *NoOpProvider) RecordCacheHit(provider string)              {}
+func (n *NoOpProvider) RecordCacheHit(provider string)                {}
-func (n *NoOpProvider) RecordCacheMiss(provider string)             {}
+func (n *NoOpProvider) RecordCacheMiss(provider string)               {}
-func (n *NoOpProvider) UpdateCacheSize(provider string, size int64) {}
+func (n *NoOpProvider) UpdateCacheSize(provider string, size int64)   {}
+func (n *NoOpProvider) RecordEventPublished(source, eventType string) {}
+func (n *NoOpProvider) RecordEventProcessed(source, eventType, status string, duration time.Duration) {
+}
+func (n *NoOpProvider) UpdateEventQueueSize(size int64) {}
 func (n *NoOpProvider) Handler() http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.WriteHeader(http.StatusNotFound)

pkg/modelregistry/model_registry.go

@@ -6,15 +6,37 @@ import (
 	"sync"
 )
 
+// ModelRules defines the permissions and security settings for a model
+type ModelRules struct {
+	CanRead          bool // Whether the model can be read (GET operations)
+	CanUpdate        bool // Whether the model can be updated (PUT/PATCH operations)
+	CanCreate        bool // Whether the model can be created (POST operations)
+	CanDelete        bool // Whether the model can be deleted (DELETE operations)
+	SecurityDisabled bool // Whether security checks are disabled for this model
+}
+
+// DefaultModelRules returns the default rules for a model (all operations allowed, security enabled)
+func DefaultModelRules() ModelRules {
+	return ModelRules{
+		CanRead:          true,
+		CanUpdate:        true,
+		CanCreate:        true,
+		CanDelete:        true,
+		SecurityDisabled: false,
+	}
+}
+
 // DefaultModelRegistry implements ModelRegistry interface
 type DefaultModelRegistry struct {
 	models map[string]interface{}
+	rules  map[string]ModelRules
 	mutex  sync.RWMutex
 }
 
 // Global default registry instance
 var defaultRegistry = &DefaultModelRegistry{
 	models: make(map[string]interface{}),
+	rules:  make(map[string]ModelRules),
 }
 
 // Global list of registries (searched in order)
@@ -25,6 +47,7 @@ var registriesMutex sync.RWMutex
 func NewModelRegistry() *DefaultModelRegistry {
 	return &DefaultModelRegistry{
 		models: make(map[string]interface{}),
+		rules:  make(map[string]ModelRules),
 	}
 }
 
@@ -98,6 +121,10 @@ func (r *DefaultModelRegistry) RegisterModel(name string, model interface{}) err
 	}
 
 	r.models[name] = model
+	// Initialize with default rules if not already set
+	if _, exists := r.rules[name]; !exists {
+		r.rules[name] = DefaultModelRules()
+	}
 	return nil
 }
 
@@ -135,6 +162,54 @@ func (r *DefaultModelRegistry) GetModelByEntity(schema, entity string) (interfac
 	return r.GetModel(entity)
 }
 
+// SetModelRules sets the rules for a specific model
+func (r *DefaultModelRegistry) SetModelRules(name string, rules ModelRules) error {
+	r.mutex.Lock()
+	defer r.mutex.Unlock()
+
+	// Check if model exists
+	if _, exists := r.models[name]; !exists {
+		return fmt.Errorf("model %s not found", name)
+	}
+
+	r.rules[name] = rules
+	return nil
+}
+
+// GetModelRules retrieves the rules for a specific model
+// Returns default rules if model exists but rules are not set
+func (r *DefaultModelRegistry) GetModelRules(name string) (ModelRules, error) {
+	r.mutex.RLock()
+	defer r.mutex.RUnlock()
+
+	// Check if model exists
+	if _, exists := r.models[name]; !exists {
+		return ModelRules{}, fmt.Errorf("model %s not found", name)
+	}
+
+	// Return rules if set, otherwise return default rules
+	if rules, exists := r.rules[name]; exists {
+		return rules, nil
+	}
+
+	return DefaultModelRules(), nil
+}
+
+// RegisterModelWithRules registers a model with specific rules
+func (r *DefaultModelRegistry) RegisterModelWithRules(name string, model interface{}, rules ModelRules) error {
+	// First register the model
+	if err := r.RegisterModel(name, model); err != nil {
+		return err
+	}
+
+	// Then set the rules (we need to lock again for rules)
+	r.mutex.Lock()
+	defer r.mutex.Unlock()
+	r.rules[name] = rules
+
+	return nil
+}
+
 // Global convenience functions using the default registry
 
 // RegisterModel registers a model with the default global registry
@@ -190,3 +265,34 @@ func GetModels() []interface{} {
 
 	return models
 }
+
+// SetModelRules sets the rules for a specific model in the default registry
+func SetModelRules(name string, rules ModelRules) error {
+	return defaultRegistry.SetModelRules(name, rules)
+}
+
+// GetModelRules retrieves the rules for a specific model from the default registry
+func GetModelRules(name string) (ModelRules, error) {
+	return defaultRegistry.GetModelRules(name)
+}
+
+// GetModelRulesByName retrieves the rules for a model by searching through all registries in order
+// Returns the first match found
+func GetModelRulesByName(name string) (ModelRules, error) {
+	registriesMutex.RLock()
+	defer registriesMutex.RUnlock()
+
+	for _, registry := range registries {
+		if _, err := registry.GetModel(name); err == nil {
+			// Model found in this registry, get its rules
+			return registry.GetModelRules(name)
+		}
+	}
+
+	return ModelRules{}, fmt.Errorf("model %s not found in any registry", name)
+}
+
+// RegisterModelWithRules registers a model with specific rules in the default registry
+func RegisterModelWithRules(model interface{}, name string, rules ModelRules) error {
+	return defaultRegistry.RegisterModelWithRules(name, model, rules)
+}

pkg/reflection/model_utils.go

@@ -1,6 +1,7 @@
 package reflection
 
 import (
+	"encoding/json"
 	"fmt"
 	"reflect"
 	"strconv"
@@ -897,6 +898,319 @@ func GetRelationModel(model interface{}, fieldName string) interface{} {
 	return currentModel
 }
 
+// MapToStruct populates a struct from a map while preserving custom types
+// It uses reflection to set struct fields based on map keys, matching by:
+// 1. Bun tag column name
+// 2. Gorm tag column name
+// 3. JSON tag name
+// 4. Field name (case-insensitive)
+// This preserves custom types that implement driver.Valuer like SqlJSONB
+func MapToStruct(dataMap map[string]interface{}, target interface{}) error {
+	if dataMap == nil || target == nil {
+		return fmt.Errorf("dataMap and target cannot be nil")
+	}
+
+	targetValue := reflect.ValueOf(target)
+	if targetValue.Kind() != reflect.Ptr {
+		return fmt.Errorf("target must be a pointer to a struct")
+	}
+
+	targetValue = targetValue.Elem()
+	if targetValue.Kind() != reflect.Struct {
+		return fmt.Errorf("target must be a pointer to a struct")
+	}
+
+	targetType := targetValue.Type()
+
+	// Create a map of column names to field indices for faster lookup
+	columnToField := make(map[string]int)
+	for i := 0; i < targetType.NumField(); i++ {
+		field := targetType.Field(i)
+
+		// Skip unexported fields
+		if !field.IsExported() {
+			continue
+		}
+
+		// Build list of possible column names for this field
+		var columnNames []string
+
+		// 1. Bun tag
+		if bunTag := field.Tag.Get("bun"); bunTag != "" && bunTag != "-" {
+			if colName := ExtractColumnFromBunTag(bunTag); colName != "" {
+				columnNames = append(columnNames, colName)
+			}
+		}
+
+		// 2. Gorm tag
+		if gormTag := field.Tag.Get("gorm"); gormTag != "" && gormTag != "-" {
+			if colName := ExtractColumnFromGormTag(gormTag); colName != "" {
+				columnNames = append(columnNames, colName)
+			}
+		}
+
+		// 3. JSON tag
+		if jsonTag := field.Tag.Get("json"); jsonTag != "" && jsonTag != "-" {
+			parts := strings.Split(jsonTag, ",")
+			if len(parts) > 0 && parts[0] != "" {
+				columnNames = append(columnNames, parts[0])
+			}
+		}
+
+		// 4. Field name variations
+		columnNames = append(columnNames, field.Name)
+		columnNames = append(columnNames, strings.ToLower(field.Name))
+		columnNames = append(columnNames, ToSnakeCase(field.Name))
+
+		// Map all column name variations to this field index
+		for _, colName := range columnNames {
+			columnToField[strings.ToLower(colName)] = i
+		}
+	}
+
+	// Iterate through the map and set struct fields
+	for key, value := range dataMap {
+		// Find the field index for this key
+		fieldIndex, found := columnToField[strings.ToLower(key)]
+		if !found {
+			// Skip keys that don't map to any field
+			continue
+		}
+
+		field := targetValue.Field(fieldIndex)
+		if !field.CanSet() {
+			continue
+		}
+
+		// Set the value, preserving custom types
+		if err := setFieldValue(field, value); err != nil {
+			return fmt.Errorf("failed to set field %s: %w", targetType.Field(fieldIndex).Name, err)
+		}
+	}
+
+	return nil
+}
+
+// setFieldValue sets a reflect.Value from an interface{} value, handling type conversions
+func setFieldValue(field reflect.Value, value interface{}) error {
+	if value == nil {
+		// Set zero value for nil
+		field.Set(reflect.Zero(field.Type()))
+		return nil
+	}
+
+	valueReflect := reflect.ValueOf(value)
+
+	// If types match exactly, just set it
+	if valueReflect.Type().AssignableTo(field.Type()) {
+		field.Set(valueReflect)
+		return nil
+	}
+
+	// Handle pointer fields
+	if field.Kind() == reflect.Ptr {
+		if valueReflect.Kind() != reflect.Ptr {
+			// Create a new pointer and set its value
+			newPtr := reflect.New(field.Type().Elem())
+			if err := setFieldValue(newPtr.Elem(), value); err != nil {
+				return err
+			}
+			field.Set(newPtr)
+			return nil
+		}
+	}
+
+	// Handle conversions for basic types
+	switch field.Kind() {
+	case reflect.String:
+		if str, ok := value.(string); ok {
+			field.SetString(str)
+			return nil
+		}
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		if num, ok := convertToInt64(value); ok {
+			if field.OverflowInt(num) {
+				return fmt.Errorf("integer overflow")
+			}
+			field.SetInt(num)
+			return nil
+		}
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
+		if num, ok := convertToUint64(value); ok {
+			if field.OverflowUint(num) {
+				return fmt.Errorf("unsigned integer overflow")
+			}
+			field.SetUint(num)
+			return nil
+		}
+	case reflect.Float32, reflect.Float64:
+		if num, ok := convertToFloat64(value); ok {
+			if field.OverflowFloat(num) {
+				return fmt.Errorf("float overflow")
+			}
+			field.SetFloat(num)
+			return nil
+		}
+	case reflect.Bool:
+		if b, ok := value.(bool); ok {
+			field.SetBool(b)
+			return nil
+		}
+	case reflect.Slice:
+		// Handle []byte specially (for types like SqlJSONB)
+		if field.Type().Elem().Kind() == reflect.Uint8 {
+			switch v := value.(type) {
+			case []byte:
+				field.SetBytes(v)
+				return nil
+			case string:
+				field.SetBytes([]byte(v))
+				return nil
+			case map[string]interface{}, []interface{}:
+				// Marshal complex types to JSON for SqlJSONB fields
+				jsonBytes, err := json.Marshal(v)
+				if err != nil {
+					return fmt.Errorf("failed to marshal value to JSON: %w", err)
+				}
+				field.SetBytes(jsonBytes)
+				return nil
+			}
+		}
+	}
+
+	// Handle struct types (like SqlTimeStamp, SqlDate, SqlTime which wrap SqlNull[time.Time])
+	if field.Kind() == reflect.Struct {
+		// Try to find a "Val" field (for SqlNull types) and set it
+		valField := field.FieldByName("Val")
+		if valField.IsValid() && valField.CanSet() {
+			// Also set Valid field to true
+			validField := field.FieldByName("Valid")
+			if validField.IsValid() && validField.CanSet() && validField.Kind() == reflect.Bool {
+				// Set the Val field
+				if err := setFieldValue(valField, value); err != nil {
+					return err
+				}
+				// Set Valid to true
+				validField.SetBool(true)
+				return nil
+			}
+		}
+	}
+
+	// If we can convert the type, do it
+	if valueReflect.Type().ConvertibleTo(field.Type()) {
+		field.Set(valueReflect.Convert(field.Type()))
+		return nil
+	}
+
+	return fmt.Errorf("cannot convert %v to %v", valueReflect.Type(), field.Type())
+}
+
+// convertToInt64 attempts to convert various types to int64
+func convertToInt64(value interface{}) (int64, bool) {
+	switch v := value.(type) {
+	case int:
+		return int64(v), true
+	case int8:
+		return int64(v), true
+	case int16:
+		return int64(v), true
+	case int32:
+		return int64(v), true
+	case int64:
+		return v, true
+	case uint:
+		return int64(v), true
+	case uint8:
+		return int64(v), true
+	case uint16:
+		return int64(v), true
+	case uint32:
+		return int64(v), true
+	case uint64:
+		return int64(v), true
+	case float32:
+		return int64(v), true
+	case float64:
+		return int64(v), true
+	case string:
+		if num, err := strconv.ParseInt(v, 10, 64); err == nil {
+			return num, true
+		}
+	}
+	return 0, false
+}
+
+// convertToUint64 attempts to convert various types to uint64
+func convertToUint64(value interface{}) (uint64, bool) {
+	switch v := value.(type) {
+	case int:
+		return uint64(v), true
+	case int8:
+		return uint64(v), true
+	case int16:
+		return uint64(v), true
+	case int32:
+		return uint64(v), true
+	case int64:
+		return uint64(v), true
+	case uint:
+		return uint64(v), true
+	case uint8:
+		return uint64(v), true
+	case uint16:
+		return uint64(v), true
+	case uint32:
+		return uint64(v), true
+	case uint64:
+		return v, true
+	case float32:
+		return uint64(v), true
+	case float64:
+		return uint64(v), true
+	case string:
+		if num, err := strconv.ParseUint(v, 10, 64); err == nil {
+			return num, true
+		}
+	}
+	return 0, false
+}
+
+// convertToFloat64 attempts to convert various types to float64
+func convertToFloat64(value interface{}) (float64, bool) {
+	switch v := value.(type) {
+	case int:
+		return float64(v), true
+	case int8:
+		return float64(v), true
+	case int16:
+		return float64(v), true
+	case int32:
+		return float64(v), true
+	case int64:
+		return float64(v), true
+	case uint:
+		return float64(v), true
+	case uint8:
+		return float64(v), true
+	case uint16:
+		return float64(v), true
+	case uint32:
+		return float64(v), true
+	case uint64:
+		return float64(v), true
+	case float32:
+		return float64(v), true
+	case float64:
+		return v, true
+	case string:
+		if num, err := strconv.ParseFloat(v, 64); err == nil {
+			return num, true
+		}
+	}
+	return 0, false
+}
+
 // getRelationModelSingleLevel gets the model type for a single level field (non-recursive)
 // This is a helper function used by GetRelationModel to handle one level at a time
 func getRelationModelSingleLevel(model interface{}, fieldName string) interface{} {

pkg/reflection/model_utils_sqltypes_test.go

@@ -0,0 +1,266 @@
+package reflection_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/bitechdev/ResolveSpec/pkg/common"
+	"github.com/bitechdev/ResolveSpec/pkg/reflection"
+)
+
+func TestMapToStruct_SqlJSONB_PreservesDriverValuer(t *testing.T) {
+	// Test that SqlJSONB type preserves driver.Valuer interface
+	type TestModel struct {
+		ID   int64           `bun:"id,pk" json:"id"`
+		Meta common.SqlJSONB `bun:"meta" json:"meta"`
+	}
+
+	dataMap := map[string]interface{}{
+		"id": int64(123),
+		"meta": map[string]interface{}{
+			"key": "value",
+			"num": 42,
+		},
+	}
+
+	var result TestModel
+	err := reflection.MapToStruct(dataMap, &result)
+	if err != nil {
+		t.Fatalf("MapToStruct() error = %v", err)
+	}
+
+	// Verify the field was set
+	if result.ID != 123 {
+		t.Errorf("ID = %v, want 123", result.ID)
+	}
+
+	// Verify SqlJSONB was populated
+	if len(result.Meta) == 0 {
+		t.Error("Meta is empty, want non-empty")
+	}
+
+	// Most importantly: verify driver.Valuer interface works
+	value, err := result.Meta.Value()
+	if err != nil {
+		t.Errorf("Meta.Value() error = %v, want nil", err)
+	}
+
+	// Value should return a string representation of the JSON
+	if value == nil {
+		t.Error("Meta.Value() returned nil, want non-nil")
+	}
+
+	// Check it's a valid JSON string
+	if str, ok := value.(string); ok {
+		if len(str) == 0 {
+			t.Error("Meta.Value() returned empty string, want valid JSON")
+		}
+		t.Logf("SqlJSONB.Value() returned: %s", str)
+	} else {
+		t.Errorf("Meta.Value() returned type %T, want string", value)
+	}
+}
+
+func TestMapToStruct_SqlJSONB_FromBytes(t *testing.T) {
+	// Test that SqlJSONB can be set from []byte directly
+	type TestModel struct {
+		ID   int64           `bun:"id,pk" json:"id"`
+		Meta common.SqlJSONB `bun:"meta" json:"meta"`
+	}
+
+	jsonBytes := []byte(`{"direct":"bytes"}`)
+	dataMap := map[string]interface{}{
+		"id":   int64(456),
+		"meta": jsonBytes,
+	}
+
+	var result TestModel
+	err := reflection.MapToStruct(dataMap, &result)
+	if err != nil {
+		t.Fatalf("MapToStruct() error = %v", err)
+	}
+
+	if result.ID != 456 {
+		t.Errorf("ID = %v, want 456", result.ID)
+	}
+
+	if string(result.Meta) != string(jsonBytes) {
+		t.Errorf("Meta = %s, want %s", string(result.Meta), string(jsonBytes))
+	}
+
+	// Verify driver.Valuer works
+	value, err := result.Meta.Value()
+	if err != nil {
+		t.Errorf("Meta.Value() error = %v", err)
+	}
+	if value == nil {
+		t.Error("Meta.Value() returned nil")
+	}
+}
+
+func TestMapToStruct_AllSqlTypes(t *testing.T) {
+	// Test model with all SQL custom types
+	type TestModel struct {
+		ID        int64               `bun:"id,pk" json:"id"`
+		Name      string              `bun:"name" json:"name"`
+		CreatedAt common.SqlTimeStamp `bun:"created_at" json:"created_at"`
+		BirthDate common.SqlDate      `bun:"birth_date" json:"birth_date"`
+		LoginTime common.SqlTime      `bun:"login_time" json:"login_time"`
+		Meta      common.SqlJSONB     `bun:"meta" json:"meta"`
+		Tags      common.SqlJSONB     `bun:"tags" json:"tags"`
+	}
+
+	now := time.Now()
+	birthDate := time.Date(1990, 1, 15, 0, 0, 0, 0, time.UTC)
+	loginTime := time.Date(0, 1, 1, 14, 30, 0, 0, time.UTC)
+
+	dataMap := map[string]interface{}{
+		"id":         int64(100),
+		"name":       "Test User",
+		"created_at": now,
+		"birth_date": birthDate,
+		"login_time": loginTime,
+		"meta": map[string]interface{}{
+			"role":   "admin",
+			"active": true,
+		},
+		"tags": []interface{}{"golang", "testing", "sql"},
+	}
+
+	var result TestModel
+	err := reflection.MapToStruct(dataMap, &result)
+	if err != nil {
+		t.Fatalf("MapToStruct() error = %v", err)
+	}
+
+	// Verify basic fields
+	if result.ID != 100 {
+		t.Errorf("ID = %v, want 100", result.ID)
+	}
+	if result.Name != "Test User" {
+		t.Errorf("Name = %v, want 'Test User'", result.Name)
+	}
+
+	// Verify SqlTimeStamp
+	if !result.CreatedAt.Valid {
+		t.Error("CreatedAt.Valid = false, want true")
+	}
+	if !result.CreatedAt.Val.Equal(now) {
+		t.Errorf("CreatedAt.Val = %v, want %v", result.CreatedAt.Val, now)
+	}
+
+	// Verify driver.Valuer for SqlTimeStamp
+	tsValue, err := result.CreatedAt.Value()
+	if err != nil {
+		t.Errorf("CreatedAt.Value() error = %v", err)
+	}
+	if tsValue == nil {
+		t.Error("CreatedAt.Value() returned nil")
+	}
+
+	// Verify SqlDate
+	if !result.BirthDate.Valid {
+		t.Error("BirthDate.Valid = false, want true")
+	}
+	if !result.BirthDate.Val.Equal(birthDate) {
+		t.Errorf("BirthDate.Val = %v, want %v", result.BirthDate.Val, birthDate)
+	}
+
+	// Verify driver.Valuer for SqlDate
+	dateValue, err := result.BirthDate.Value()
+	if err != nil {
+		t.Errorf("BirthDate.Value() error = %v", err)
+	}
+	if dateValue == nil {
+		t.Error("BirthDate.Value() returned nil")
+	}
+
+	// Verify SqlTime
+	if !result.LoginTime.Valid {
+		t.Error("LoginTime.Valid = false, want true")
+	}
+
+	// Verify driver.Valuer for SqlTime
+	timeValue, err := result.LoginTime.Value()
+	if err != nil {
+		t.Errorf("LoginTime.Value() error = %v", err)
+	}
+	if timeValue == nil {
+		t.Error("LoginTime.Value() returned nil")
+	}
+
+	// Verify SqlJSONB for Meta
+	if len(result.Meta) == 0 {
+		t.Error("Meta is empty")
+	}
+	metaValue, err := result.Meta.Value()
+	if err != nil {
+		t.Errorf("Meta.Value() error = %v", err)
+	}
+	if metaValue == nil {
+		t.Error("Meta.Value() returned nil")
+	}
+
+	// Verify SqlJSONB for Tags
+	if len(result.Tags) == 0 {
+		t.Error("Tags is empty")
+	}
+	tagsValue, err := result.Tags.Value()
+	if err != nil {
+		t.Errorf("Tags.Value() error = %v", err)
+	}
+	if tagsValue == nil {
+		t.Error("Tags.Value() returned nil")
+	}
+
+	t.Logf("All SQL types successfully preserved driver.Valuer interface:")
+	t.Logf("  - SqlTimeStamp: %v", tsValue)
+	t.Logf("  - SqlDate: %v", dateValue)
+	t.Logf("  - SqlTime: %v", timeValue)
+	t.Logf("  - SqlJSONB (Meta): %v", metaValue)
+	t.Logf("  - SqlJSONB (Tags): %v", tagsValue)
+}
+
+func TestMapToStruct_SqlNull_NilValues(t *testing.T) {
+	// Test that SqlNull types handle nil values correctly
+	type TestModel struct {
+		ID        int64               `bun:"id,pk" json:"id"`
+		UpdatedAt common.SqlTimeStamp `bun:"updated_at" json:"updated_at"`
+		DeletedAt common.SqlTimeStamp `bun:"deleted_at" json:"deleted_at"`
+	}
+
+	now := time.Now()
+	dataMap := map[string]interface{}{
+		"id":         int64(200),
+		"updated_at": now,
+		"deleted_at": nil, // Explicitly nil
+	}
+
+	var result TestModel
+	err := reflection.MapToStruct(dataMap, &result)
+	if err != nil {
+		t.Fatalf("MapToStruct() error = %v", err)
+	}
+
+	// UpdatedAt should be valid
+	if !result.UpdatedAt.Valid {
+		t.Error("UpdatedAt.Valid = false, want true")
+	}
+	if !result.UpdatedAt.Val.Equal(now) {
+		t.Errorf("UpdatedAt.Val = %v, want %v", result.UpdatedAt.Val, now)
+	}
+
+	// DeletedAt should be invalid (null)
+	if result.DeletedAt.Valid {
+		t.Error("DeletedAt.Valid = true, want false (null)")
+	}
+
+	// Verify driver.Valuer for null SqlTimeStamp
+	deletedValue, err := result.DeletedAt.Value()
+	if err != nil {
+		t.Errorf("DeletedAt.Value() error = %v", err)
+	}
+	if deletedValue != nil {
+		t.Errorf("DeletedAt.Value() = %v, want nil", deletedValue)
+	}
+}

pkg/reflection/model_utils_test.go

@@ -1687,3 +1687,201 @@ func TestGetRelationModel_WithTags(t *testing.T) {
 		})
 	}
 }
+
+func TestMapToStruct(t *testing.T) {
+	// Test model with various field types
+	type TestModel struct {
+		ID       int64   `bun:"id,pk" json:"id"`
+		Name     string  `bun:"name" json:"name"`
+		Age      int     `bun:"age" json:"age"`
+		Active   bool    `bun:"active" json:"active"`
+		Score    float64 `bun:"score" json:"score"`
+		Data     []byte  `bun:"data" json:"data"`
+		MetaJSON []byte  `bun:"meta_json" json:"meta_json"`
+	}
+
+	tests := []struct {
+		name     string
+		dataMap  map[string]interface{}
+		expected TestModel
+		wantErr  bool
+	}{
+		{
+			name: "Basic types conversion",
+			dataMap: map[string]interface{}{
+				"id":     int64(123),
+				"name":   "Test User",
+				"age":    30,
+				"active": true,
+				"score":  95.5,
+			},
+			expected: TestModel{
+				ID:     123,
+				Name:   "Test User",
+				Age:    30,
+				Active: true,
+				Score:  95.5,
+			},
+			wantErr: false,
+		},
+		{
+			name: "Byte slice (SqlJSONB-like) from []byte",
+			dataMap: map[string]interface{}{
+				"id":   int64(456),
+				"name": "JSON Test",
+				"data": []byte(`{"key":"value"}`),
+			},
+			expected: TestModel{
+				ID:   456,
+				Name: "JSON Test",
+				Data: []byte(`{"key":"value"}`),
+			},
+			wantErr: false,
+		},
+		{
+			name: "Byte slice from string",
+			dataMap: map[string]interface{}{
+				"id":   int64(789),
+				"data": "string data",
+			},
+			expected: TestModel{
+				ID:   789,
+				Data: []byte("string data"),
+			},
+			wantErr: false,
+		},
+		{
+			name: "Byte slice from map (JSON marshal)",
+			dataMap: map[string]interface{}{
+				"id": int64(999),
+				"meta_json": map[string]interface{}{
+					"field1": "value1",
+					"field2": 42,
+				},
+			},
+			expected: TestModel{
+				ID:       999,
+				MetaJSON: []byte(`{"field1":"value1","field2":42}`),
+			},
+			wantErr: false,
+		},
+		{
+			name: "Byte slice from slice (JSON marshal)",
+			dataMap: map[string]interface{}{
+				"id":        int64(111),
+				"meta_json": []interface{}{"item1", "item2", 3},
+			},
+			expected: TestModel{
+				ID:       111,
+				MetaJSON: []byte(`["item1","item2",3]`),
+			},
+			wantErr: false,
+		},
+		{
+			name: "Field matching by bun tag",
+			dataMap: map[string]interface{}{
+				"id":   int64(222),
+				"name": "Tagged Field",
+			},
+			expected: TestModel{
+				ID:   222,
+				Name: "Tagged Field",
+			},
+			wantErr: false,
+		},
+		{
+			name: "Nil values",
+			dataMap: map[string]interface{}{
+				"id":   int64(333),
+				"data": nil,
+			},
+			expected: TestModel{
+				ID:   333,
+				Data: nil,
+			},
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var result TestModel
+			err := MapToStruct(tt.dataMap, &result)
+
+			if (err != nil) != tt.wantErr {
+				t.Errorf("MapToStruct() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+
+			// Compare fields individually for better error messages
+			if result.ID != tt.expected.ID {
+				t.Errorf("ID = %v, want %v", result.ID, tt.expected.ID)
+			}
+			if result.Name != tt.expected.Name {
+				t.Errorf("Name = %v, want %v", result.Name, tt.expected.Name)
+			}
+			if result.Age != tt.expected.Age {
+				t.Errorf("Age = %v, want %v", result.Age, tt.expected.Age)
+			}
+			if result.Active != tt.expected.Active {
+				t.Errorf("Active = %v, want %v", result.Active, tt.expected.Active)
+			}
+			if result.Score != tt.expected.Score {
+				t.Errorf("Score = %v, want %v", result.Score, tt.expected.Score)
+			}
+
+			// For byte slices, compare as strings for JSON data
+			if tt.expected.Data != nil {
+				if string(result.Data) != string(tt.expected.Data) {
+					t.Errorf("Data = %s, want %s", string(result.Data), string(tt.expected.Data))
+				}
+			}
+			if tt.expected.MetaJSON != nil {
+				if string(result.MetaJSON) != string(tt.expected.MetaJSON) {
+					t.Errorf("MetaJSON = %s, want %s", string(result.MetaJSON), string(tt.expected.MetaJSON))
+				}
+			}
+		})
+	}
+}
+
+func TestMapToStruct_Errors(t *testing.T) {
+	type TestModel struct {
+		ID int `bun:"id" json:"id"`
+	}
+
+	tests := []struct {
+		name    string
+		dataMap map[string]interface{}
+		target  interface{}
+		wantErr bool
+	}{
+		{
+			name:    "Nil dataMap",
+			dataMap: nil,
+			target:  &TestModel{},
+			wantErr: true,
+		},
+		{
+			name:    "Nil target",
+			dataMap: map[string]interface{}{"id": 1},
+			target:  nil,
+			wantErr: true,
+		},
+		{
+			name:    "Non-pointer target",
+			dataMap: map[string]interface{}{"id": 1},
+			target:  TestModel{},
+			wantErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := MapToStruct(tt.dataMap, tt.target)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("MapToStruct() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}

pkg/resolvespec/hooks.go

@@ -56,6 +56,10 @@ type HookContext struct {
 	Abort        bool   // If set to true, the operation will be aborted
 	AbortMessage string // Message to return if aborted
 	AbortCode    int    // HTTP status code if aborted
+
+	// Tx provides access to the database/transaction for executing additional SQL
+	// This allows hooks to run custom queries in addition to the main Query chain
+	Tx common.Database
 }
 
 // HookFunc is the signature for hook functions

pkg/restheadspec/handler.go

@@ -127,7 +127,7 @@ func (h *Handler) Handle(w common.ResponseWriter, r common.Request, params map[s
 
 	// Validate and filter columns in options (log warnings for invalid columns)
 	validator := common.NewColumnValidator(model)
-	options = filterExtendedOptions(validator, options)
+	options = h.filterExtendedOptions(validator, options, model)
 
 	// Add request-scoped data to context (including options)
 	ctx = WithRequestData(ctx, schema, entity, tableName, model, modelPtr, options)
@@ -300,6 +300,7 @@ func (h *Handler) handleRead(ctx context.Context, w common.ResponseWriter, id st
 		Options:   options,
 		ID:        id,
 		Writer:    w,
+		Tx:        h.db,
 	}
 
 	if err := h.hooks.Execute(BeforeRead, hookCtx); err != nil {
@@ -745,9 +746,42 @@ func (h *Handler) applyPreloadWithRecursion(query common.SelectQuery, preload co
 
 			// Apply ComputedQL fields if any
 			if len(preload.ComputedQL) > 0 {
+				// Get the base table name from the related model
+				baseTableName := getTableNameFromModel(relatedModel)
+
+				// Convert the preload relation path to the appropriate alias format
+				// This is ORM-specific. Currently we only support Bun's format.
+				// TODO: Add support for other ORMs if needed
+				preloadAlias := ""
+				if h.db.GetUnderlyingDB() != nil {
+					// Check if we're using Bun by checking the type name
+					underlyingType := fmt.Sprintf("%T", h.db.GetUnderlyingDB())
+					if strings.Contains(underlyingType, "bun.DB") {
+						// Use Bun's alias format: lowercase with double underscores
+						preloadAlias = relationPathToBunAlias(preload.Relation)
+					}
+					// For GORM: GORM doesn't use the same alias format, and this fix
+					// may not be needed since GORM handles preloads differently
+				}
+
+				logger.Debug("Applying computed columns to preload %s (alias: %s, base table: %s)",
+					preload.Relation, preloadAlias, baseTableName)
+
 				for colName, colExpr := range preload.ComputedQL {
+					// Replace table references in the expression with the preload alias
+					// This fixes the ambiguous column reference issue when there are multiple
+					// levels of recursive/nested preloads
+					adjustedExpr := colExpr
+					if baseTableName != "" && preloadAlias != "" {
+						adjustedExpr = replaceTableReferencesInSQL(colExpr, baseTableName, preloadAlias)
+						if adjustedExpr != colExpr {
+							logger.Debug("Adjusted computed column expression for %s: '%s' -> '%s'",
+								colName, colExpr, adjustedExpr)
+						}
+					}
+
 					logger.Debug("Applying computed column to preload %s: %s", preload.Relation, colName)
-					sq = sq.ColumnExpr(fmt.Sprintf("(%s) AS %s", colExpr, colName))
+					sq = sq.ColumnExpr(fmt.Sprintf("(%s) AS %s", adjustedExpr, colName))
 					// Remove the computed column from selected columns to avoid duplication
 					for colIndex := range preload.Columns {
 						if preload.Columns[colIndex] == colName {
@@ -840,6 +874,73 @@ func (h *Handler) applyPreloadWithRecursion(query common.SelectQuery, preload co
 	return query
 }
 
+// relationPathToBunAlias converts a relation path like "MAL.MAL.DEF" to the Bun alias format "mal__mal__def"
+// Bun generates aliases for nested relations by lowercasing and replacing dots with double underscores
+func relationPathToBunAlias(relationPath string) string {
+	if relationPath == "" {
+		return ""
+	}
+	// Convert to lowercase and replace dots with double underscores
+	alias := strings.ToLower(relationPath)
+	alias = strings.ReplaceAll(alias, ".", "__")
+	return alias
+}
+
+// replaceTableReferencesInSQL replaces references to a base table name in a SQL expression
+// with the appropriate alias for the current preload level
+// For example, if baseTableName is "mastertaskitem" and targetAlias is "mal__mal",
+// it will replace "mastertaskitem.rid_mastertaskitem" with "mal__mal.rid_mastertaskitem"
+func replaceTableReferencesInSQL(sqlExpr, baseTableName, targetAlias string) string {
+	if sqlExpr == "" || baseTableName == "" || targetAlias == "" {
+		return sqlExpr
+	}
+
+	// Replace both quoted and unquoted table references
+	// Handle patterns like: tablename.column, "tablename".column, tablename."column", "tablename"."column"
+
+	// Pattern 1: tablename.column (unquoted)
+	result := strings.ReplaceAll(sqlExpr, baseTableName+".", targetAlias+".")
+
+	// Pattern 2: "tablename".column or "tablename"."column" (quoted table name)
+	result = strings.ReplaceAll(result, "\""+baseTableName+"\".", "\""+targetAlias+"\".")
+
+	return result
+}
+
+// getTableNameFromModel extracts the table name from a model
+// It checks the bun tag first, then falls back to converting the struct name to snake_case
+func getTableNameFromModel(model interface{}) string {
+	if model == nil {
+		return ""
+	}
+
+	modelType := reflect.TypeOf(model)
+
+	// Unwrap pointers
+	for modelType != nil && modelType.Kind() == reflect.Ptr {
+		modelType = modelType.Elem()
+	}
+
+	if modelType == nil || modelType.Kind() != reflect.Struct {
+		return ""
+	}
+
+	// Look for bun tag on embedded BaseModel
+	for i := 0; i < modelType.NumField(); i++ {
+		field := modelType.Field(i)
+		if field.Anonymous {
+			bunTag := field.Tag.Get("bun")
+			if strings.HasPrefix(bunTag, "table:") {
+				return strings.TrimPrefix(bunTag, "table:")
+			}
+		}
+	}
+
+	// Fallback: convert struct name to lowercase (simple heuristic)
+	// This handles cases like "MasterTaskItem" -> "mastertaskitem"
+	return strings.ToLower(modelType.Name())
+}
+
 func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, data interface{}, options ExtendedRequestOptions) {
 	// Capture panics and return error response
 	defer func() {
@@ -866,6 +967,7 @@ func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, dat
 		Options:   options,
 		Data:      data,
 		Writer:    w,
+		Tx:        h.db,
 	}
 
 	if err := h.hooks.Execute(BeforeCreate, hookCtx); err != nil {
@@ -955,6 +1057,7 @@ func (h *Handler) handleCreate(ctx context.Context, w common.ResponseWriter, dat
 				Data:      modelValue,
 				Writer:    w,
 				Query:     query,
+				Tx:        tx,
 			}
 			if err := h.hooks.Execute(BeforeScan, itemHookCtx); err != nil {
 				return fmt.Errorf("BeforeScan hook failed for item %d: %w", i, err)
@@ -1047,6 +1150,7 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, id
 		Schema:    schema,
 		Entity:    entity,
 		TableName: tableName,
+		Tx:        h.db,
 		Model:     model,
 		Options:   options,
 		ID:        id,
@@ -1116,12 +1220,19 @@ func (h *Handler) handleUpdate(ctx context.Context, w common.ResponseWriter, id
 		// Ensure ID is in the data map for the update
 		dataMap[pkName] = targetID
 
-		// Create update query
+		// Populate model instance from dataMap to preserve custom types (like SqlJSONB)
-		query := tx.NewUpdate().Table(tableName).SetMap(dataMap)
+		modelInstance := reflect.New(reflect.TypeOf(model).Elem()).Interface()
+		if err := reflection.MapToStruct(dataMap, modelInstance); err != nil {
+			return fmt.Errorf("failed to populate model from data: %w", err)
+		}
+
+		// Create update query using Model() to preserve custom types and driver.Valuer interfaces
+		query := tx.NewUpdate().Model(modelInstance).Table(tableName)
 		query = query.Where(fmt.Sprintf("%s = ?", common.QuoteIdent(pkName)), targetID)
 
 		// Execute BeforeScan hooks - pass query chain so hooks can modify it
 		hookCtx.Query = query
+		hookCtx.Tx = tx
 		if err := h.hooks.Execute(BeforeScan, hookCtx); err != nil {
 			return fmt.Errorf("BeforeScan hook failed: %w", err)
 		}
@@ -1217,6 +1328,7 @@ func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, id
 						Model:     model,
 						ID:        itemID,
 						Writer:    w,
+						Tx:        tx,
 					}
 
 					if err := h.hooks.Execute(BeforeDelete, hookCtx); err != nil {
@@ -1285,6 +1397,7 @@ func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, id
 						Model:     model,
 						ID:        itemIDStr,
 						Writer:    w,
+						Tx:        tx,
 					}
 
 					if err := h.hooks.Execute(BeforeDelete, hookCtx); err != nil {
@@ -1337,6 +1450,7 @@ func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, id
 							Model:     model,
 							ID:        itemIDStr,
 							Writer:    w,
+							Tx:        tx,
 						}
 
 						if err := h.hooks.Execute(BeforeDelete, hookCtx); err != nil {
@@ -1390,6 +1504,7 @@ func (h *Handler) handleDelete(ctx context.Context, w common.ResponseWriter, id
 		Model:     model,
 		ID:        id,
 		Writer:    w,
+		Tx:        h.db,
 	}
 
 	if err := h.hooks.Execute(BeforeDelete, hookCtx); err != nil {
@@ -2241,7 +2356,7 @@ func (h *Handler) setRowNumbersOnRecords(records any, offset int) {
 }
 
 // filterExtendedOptions filters all column references, removing invalid ones and logging warnings
-func filterExtendedOptions(validator *common.ColumnValidator, options ExtendedRequestOptions) ExtendedRequestOptions {
+func (h *Handler) filterExtendedOptions(validator *common.ColumnValidator, options ExtendedRequestOptions, model interface{}) ExtendedRequestOptions {
 	filtered := options
 
 	// Filter base RequestOptions
@@ -2265,12 +2380,30 @@ func filterExtendedOptions(validator *common.ColumnValidator, options ExtendedRe
 	// No filtering needed for ComputedQL keys
 	filtered.ComputedQL = options.ComputedQL
 
-	// Filter Expand columns
+	// Filter Expand columns using the expand relation's model
 	filteredExpands := make([]ExpandOption, 0, len(options.Expand))
+	modelType := reflect.TypeOf(model)
+	if modelType.Kind() == reflect.Ptr {
+		modelType = modelType.Elem()
+	}
+
 	for _, expand := range options.Expand {
 		filteredExpand := expand
-		// Don't validate relation name, only columns
+
-		filteredExpand.Columns = validator.FilterValidColumns(expand.Columns)
+		// Get the relationship info for this expand relation
+		relInfo := h.getRelationshipInfo(modelType, expand.Relation)
+		if relInfo != nil && relInfo.relatedModel != nil {
+			// Create a validator for the related model
+			expandValidator := common.NewColumnValidator(relInfo.relatedModel)
+			// Filter columns using the related model's validator
+			filteredExpand.Columns = expandValidator.FilterValidColumns(expand.Columns)
+		} else {
+			// If we can't find the relationship, log a warning and skip column filtering
+			logger.Warn("Cannot validate columns for unknown relation: %s", expand.Relation)
+			// Keep the columns as-is if we can't validate them
+			filteredExpand.Columns = expand.Columns
+		}
+
 		filteredExpands = append(filteredExpands, filteredExpand)
 	}
 	filtered.Expand = filteredExpands

pkg/restheadspec/hooks.go

@@ -55,6 +55,10 @@ type HookContext struct {
 
 	// Response writer - allows hooks to modify response
 	Writer common.ResponseWriter
+
+	// Tx provides access to the database/transaction for executing additional SQL
+	// This allows hooks to run custom queries in addition to the main Query chain
+	Tx common.Database
 }
 
 // HookFunc is the signature for hook functions

pkg/restheadspec/hooks_example.go

@@ -150,6 +150,50 @@ func ExampleRelatedDataHook(ctx *HookContext) error {
 	return nil
 }
 
+// ExampleTxHook demonstrates using the Tx field to execute additional SQL queries
+// The Tx field provides access to the database/transaction for custom queries
+func ExampleTxHook(ctx *HookContext) error {
+	// Example: Execute additional SQL operations alongside the main query
+	// This is useful for maintaining data consistency, updating related records, etc.
+
+	if ctx.Entity == "orders" && ctx.Data != nil {
+		// Example: Update inventory when an order is created
+		// Extract product ID and quantity from the order data
+		// dataMap, ok := ctx.Data.(map[string]interface{})
+		// if !ok {
+		// 	return fmt.Errorf("invalid data format")
+		// }
+		// productID := dataMap["product_id"]
+		// quantity := dataMap["quantity"]
+
+		// Use ctx.Tx to execute additional SQL queries
+		// The Tx field contains the same database/transaction as the main operation
+		// If inside a transaction, your queries will be part of the same transaction
+		// query := ctx.Tx.NewUpdate().
+		// 	Table("inventory").
+		// 	Set("quantity = quantity - ?", quantity).
+		// 	Where("product_id = ?", productID)
+		//
+		// if _, err := query.Exec(ctx.Context); err != nil {
+		// 	logger.Error("Failed to update inventory: %v", err)
+		// 	return fmt.Errorf("failed to update inventory: %w", err)
+		// }
+
+		// You can also execute raw SQL using ctx.Tx
+		// var result []map[string]interface{}
+		// err := ctx.Tx.Query(ctx.Context, &result,
+		// 	"INSERT INTO order_history (order_id, status) VALUES (?, ?)",
+		// 	orderID, "pending")
+		// if err != nil {
+		// 	return fmt.Errorf("failed to insert order history: %w", err)
+		// }
+
+		logger.Debug("Executed additional SQL for order entity")
+	}
+
+	return nil
+}
+
 // SetupExampleHooks demonstrates how to register hooks on a handler
 func SetupExampleHooks(handler *Handler) {
 	hooks := handler.Hooks()

pkg/security/interfaces.go

@@ -29,10 +29,11 @@ type LoginRequest struct {
 
 // LoginResponse contains the result of a login attempt
 type LoginResponse struct {
-	Token        string       `json:"token"`
+	Token        string         `json:"token"`
-	RefreshToken string       `json:"refresh_token"`
+	RefreshToken string         `json:"refresh_token"`
-	User         *UserContext `json:"user"`
+	User         *UserContext   `json:"user"`
-	ExpiresIn    int64        `json:"expires_in"` // Token expiration in seconds
+	ExpiresIn    int64          `json:"expires_in"` // Token expiration in seconds
+	Meta         map[string]any `json:"meta"`       // Additional metadata to be set on user context
 }
 
 // LogoutRequest contains information for logout

pkg/security/providers.go

@@ -111,7 +111,7 @@ func (a *DatabaseAuthenticator) Login(ctx context.Context, req LoginRequest) (*L
 	var dataJSON sql.NullString
 
 	query := `SELECT p_success, p_error, p_data::text FROM resolvespec_login($1::jsonb)`
-	err = a.db.QueryRowContext(ctx, query, reqJSON).Scan(&success, &errorMsg, &dataJSON)
+	err = a.db.QueryRowContext(ctx, query, string(reqJSON)).Scan(&success, &errorMsg, &dataJSON)
 	if err != nil {
 		return nil, fmt.Errorf("login query failed: %w", err)
 	}
@@ -145,7 +145,7 @@ func (a *DatabaseAuthenticator) Logout(ctx context.Context, req LogoutRequest) e
 	var dataJSON sql.NullString
 
 	query := `SELECT p_success, p_error, p_data::text FROM resolvespec_logout($1::jsonb)`
-	err = a.db.QueryRowContext(ctx, query, reqJSON).Scan(&success, &errorMsg, &dataJSON)
+	err = a.db.QueryRowContext(ctx, query, string(reqJSON)).Scan(&success, &errorMsg, &dataJSON)
 	if err != nil {
 		return fmt.Errorf("logout query failed: %w", err)
 	}
@@ -297,7 +297,7 @@ func (a *DatabaseAuthenticator) updateSessionActivity(ctx context.Context, sessi
 	var updatedUserJSON sql.NullString
 
 	query := `SELECT p_success, p_error, p_user::text FROM resolvespec_session_update($1, $2::jsonb)`
-	_ = a.db.QueryRowContext(ctx, query, sessionToken, userJSON).Scan(&success, &errorMsg, &updatedUserJSON)
+	_ = a.db.QueryRowContext(ctx, query, sessionToken, string(userJSON)).Scan(&success, &errorMsg, &updatedUserJSON)
 }
 
 // RefreshToken implements Refreshable interface