feat(resolvemcp): add hook system for model operations

* Implement hooks for CRUD operations: before/after handle, read, create, update, delete.
* Introduce HookContext and HookRegistry for managing hooks.
* Allow registration and execution of multiple hooks per operation.

feat(resolvemcp): implement MCP tools for CRUD operations
* Register tools for reading, creating, updating, and deleting records.
* Define tool arguments and handle requests with appropriate responses.
* Support for resource registration with metadata.

fix(restheadspec): enhance cursor handling for joins
* Improve cursor filter generation to support lateral joins.
* Update join alias extraction to handle lateral joins correctly.
* Ensure cursor filters do not contain empty comparisons.

test(restheadspec): add tests for cursor filters and join alias extraction
* Create tests for lateral join scenarios in cursor filter generation.
* Validate join alias extraction for various join types, including lateral joins.

pkg/resolvemcp/cursor.go

@@ -0,0 +1,133 @@
+package resolvemcp
+
+// Cursor-based pagination adapted from pkg/resolvespec/cursor.go.
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/bitechdev/ResolveSpec/pkg/common"
+	"github.com/bitechdev/ResolveSpec/pkg/logger"
+)
+
+type cursorDirection int
+
+const (
+	cursorForward  cursorDirection = 1
+	cursorBackward cursorDirection = -1
+)
+
+// getCursorFilter generates a SQL EXISTS subquery for cursor-based pagination.
+func getCursorFilter(
+	tableName string,
+	pkName string,
+	modelColumns []string,
+	options common.RequestOptions,
+) (string, error) {
+	fullTableName := tableName
+	if strings.Contains(tableName, ".") {
+		tableName = strings.SplitN(tableName, ".", 2)[1]
+	}
+
+	cursorID, direction := getActiveCursor(options)
+	if cursorID == "" {
+		return "", fmt.Errorf("no cursor provided for table %s", tableName)
+	}
+
+	sortItems := options.Sort
+	if len(sortItems) == 0 {
+		return "", fmt.Errorf("no sort columns defined")
+	}
+
+	var whereClauses []string
+	reverse := direction < 0
+
+	for _, s := range sortItems {
+		col := strings.TrimSpace(s.Column)
+		if col == "" {
+			continue
+		}
+
+		parts := strings.Split(col, ".")
+		field := strings.TrimSpace(parts[len(parts)-1])
+		prefix := strings.Join(parts[:len(parts)-1], ".")
+
+		desc := strings.EqualFold(s.Direction, "desc")
+		if reverse {
+			desc = !desc
+		}
+
+		cursorCol, targetCol, err := resolveCursorColumn(field, prefix, tableName, modelColumns)
+		if err != nil {
+			logger.Warn("Skipping invalid sort column %q: %v", col, err)
+			continue
+		}
+
+		op := "<"
+		if desc {
+			op = ">"
+		}
+		whereClauses = append(whereClauses, fmt.Sprintf("%s %s %s", cursorCol, op, targetCol))
+	}
+
+	if len(whereClauses) == 0 {
+		return "", fmt.Errorf("no valid sort columns after filtering")
+	}
+
+	orSQL := buildCursorPriorityChain(whereClauses)
+
+	query := fmt.Sprintf(`EXISTS (
+  SELECT 1
+  FROM %s cursor_select
+  WHERE cursor_select.%s = %s
+    AND (%s)
+)`,
+		fullTableName,
+		pkName,
+		cursorID,
+		orSQL,
+	)
+
+	return query, nil
+}
+
+func getActiveCursor(options common.RequestOptions) (id string, direction cursorDirection) {
+	if options.CursorForward != "" {
+		return options.CursorForward, cursorForward
+	}
+	if options.CursorBackward != "" {
+		return options.CursorBackward, cursorBackward
+	}
+	return "", 0
+}
+
+func resolveCursorColumn(field, prefix, tableName string, modelColumns []string) (cursorCol, targetCol string, err error) {
+	if strings.Contains(field, "->") {
+		return "cursor_select." + field, tableName + "." + field, nil
+	}
+
+	if modelColumns != nil {
+		for _, col := range modelColumns {
+			if strings.EqualFold(col, field) {
+				return "cursor_select." + field, tableName + "." + field, nil
+			}
+		}
+	} else {
+		return "cursor_select." + field, tableName + "." + field, nil
+	}
+
+	if prefix != "" && prefix != tableName {
+		return "", "", fmt.Errorf("joined columns not supported in cursor pagination: %s", field)
+	}
+
+	return "", "", fmt.Errorf("invalid column: %s", field)
+}
+
+func buildCursorPriorityChain(clauses []string) string {
+	var or []string
+	for i := 0; i < len(clauses); i++ {
+		and := strings.Join(clauses[:i+1], "\n    AND ")
+		or = append(or, "("+and+")")
+	}
+	return strings.Join(or, "\n  OR ")
+}