fix(crud): skip generated and read-only columns on insert and update

Read-merge-update wrote every model column back, so GENERATED ALWAYS
columns failed with SQLSTATE 428C9. Add a bun 'generated' tag option,
reflection.NonWritableColumns/RemoveNonWritableColumns, and apply them
in resolvespec, restheadspec, websocketspec, mqttspec, resolvemcp and
the nested CUD processor. Add ExcludeColumn to InsertQuery/UpdateQuery
for model-based writes.

pkg/common/adapters/database/bun.go

@@ -1507,6 +1507,13 @@ func (b *BunInsertQuery) OnConflict(action string) common.InsertQuery {
 	return b
 }
 
+func (b *BunInsertQuery) ExcludeColumn(columns ...string) common.InsertQuery {
+	if len(columns) > 0 {
+		b.query = b.query.ExcludeColumn(columns...)
+	}
+	return b
+}
+
 func (b *BunInsertQuery) Returning(columns ...string) common.InsertQuery {
 	if len(columns) > 0 {
 		b.query = b.query.Returning(strings.Join(columns, ", "))
@@ -1619,6 +1626,13 @@ func (b *BunUpdateQuery) SetMap(values map[string]interface{}) common.UpdateQuer
 	return b
 }
 
+func (b *BunUpdateQuery) ExcludeColumn(columns ...string) common.UpdateQuery {
+	if len(columns) > 0 {
+		b.query = b.query.ExcludeColumn(columns...)
+	}
+	return b
+}
+
 func (b *BunUpdateQuery) Where(query string, args ...interface{}) common.UpdateQuery {
 	b.query = b.query.Where(query, args...)
 	return b

pkg/common/adapters/database/gorm.go

@@ -751,6 +751,13 @@ func (g *GormInsertQuery) OnConflict(action string) common.InsertQuery {
 	return g
 }
 
+func (g *GormInsertQuery) ExcludeColumn(columns ...string) common.InsertQuery {
+	if len(columns) > 0 {
+		g.db = g.db.Omit(columns...)
+	}
+	return g
+}
+
 func (g *GormInsertQuery) Returning(columns ...string) common.InsertQuery {
 	g.returningColumns = columns
 	return g
@@ -930,6 +937,13 @@ func (g *GormUpdateQuery) SetMap(values map[string]interface{}) common.UpdateQue
 	return g
 }
 
+func (g *GormUpdateQuery) ExcludeColumn(columns ...string) common.UpdateQuery {
+	if len(columns) > 0 {
+		g.db = g.db.Omit(columns...)
+	}
+	return g
+}
+
 func (g *GormUpdateQuery) Where(query string, args ...interface{}) common.UpdateQuery {
 	g.db = g.db.Where(query, args...)
 	return g

pkg/common/adapters/database/pgsql.go

@@ -691,6 +691,13 @@ func (p *PgSQLInsertQuery) OnConflict(action string) common.InsertQuery {
 	return p
 }
 
+func (p *PgSQLInsertQuery) ExcludeColumn(columns ...string) common.InsertQuery {
+	for _, col := range columns {
+		delete(p.values, col)
+	}
+	return p
+}
+
 func (p *PgSQLInsertQuery) Returning(columns ...string) common.InsertQuery {
 	p.returning = columns
 	return p
@@ -850,6 +857,13 @@ func (p *PgSQLUpdateQuery) Set(column string, value interface{}) common.UpdateQu
 	return p
 }
 
+func (p *PgSQLUpdateQuery) ExcludeColumn(columns ...string) common.UpdateQuery {
+	for _, col := range columns {
+		delete(p.sets, col)
+	}
+	return p
+}
+
 func (p *PgSQLUpdateQuery) SetMap(values map[string]interface{}) common.UpdateQuery {
 	pkName := ""
 	if p.model != nil {

pkg/common/interfaces.go

@@ -81,6 +81,8 @@ type InsertQuery interface {
 	Table(table string) InsertQuery
 	Value(column string, value interface{}) InsertQuery
 	OnConflict(action string) InsertQuery
+	// ExcludeColumn omits columns from a Model()-based INSERT (e.g. generated columns).
+	ExcludeColumn(columns ...string) InsertQuery
 	Returning(columns ...string) InsertQuery
 
 	// Execution
@@ -94,6 +96,8 @@ type UpdateQuery interface {
 	Table(table string) UpdateQuery
 	Set(column string, value interface{}) UpdateQuery
 	SetMap(values map[string]interface{}) UpdateQuery
+	// ExcludeColumn omits columns from a Model()-based UPDATE (e.g. generated columns).
+	ExcludeColumn(columns ...string) UpdateQuery
 	Where(query string, args ...interface{}) UpdateQuery
 	Returning(columns ...string) UpdateQuery
 

pkg/common/recursive_crud.go

@@ -116,7 +116,7 @@ func (p *NestedCUDProcessor) ProcessNestedCUD(
 	case "insert", "create", "add":
 		// Only perform insert if we have data to insert
 		if hasData {
-			id, err := p.processInsert(ctx, regularData, tableName)
+			id, err := p.processInsert(ctx, regularData, model, tableName)
 			if err != nil {
 				logger.Error("Insert failed for table=%s, data=%+v, error=%v", tableName, regularData, err)
 				return nil, fmt.Errorf("insert failed: %w", err)
@@ -148,7 +148,7 @@ func (p *NestedCUDProcessor) ProcessNestedCUD(
 			return result, nil
 		}
 		if hasData {
-			rows, err := p.processUpdate(ctx, regularData, tableName, data[pkName])
+			rows, err := p.processUpdate(ctx, regularData, model, tableName, data[pkName])
 			if err != nil {
 				logger.Error("Update failed for table=%s, id=%v, data=%+v, error=%v", tableName, data[pkName], regularData, err)
 				return nil, fmt.Errorf("update failed: %w", err)
@@ -295,10 +295,12 @@ func (p *NestedCUDProcessor) injectForeignKeys(data map[string]interface{}, mode
 func (p *NestedCUDProcessor) processInsert(
 	ctx context.Context,
 	data map[string]interface{},
+	model interface{},
 	tableName string,
 ) (interface{}, error) {
 	logger.Debug("Inserting into %s with data: %+v", tableName, data)
 
+	reflection.RemoveNonWritableColumns(model, data)
 	query := p.db.NewInsert().Table(tableName)
 
 	for key, value := range data {
@@ -335,6 +337,7 @@ func (p *NestedCUDProcessor) processSelect(ctx context.Context, tableName string
 func (p *NestedCUDProcessor) processUpdate(
 	ctx context.Context,
 	data map[string]interface{},
+	model interface{},
 	tableName string,
 	id interface{},
 ) (int64, error) {
@@ -345,6 +348,7 @@ func (p *NestedCUDProcessor) processUpdate(
 
 	logger.Debug("Updating %s with ID %v, data: %+v", tableName, id, data)
 
+	reflection.RemoveNonWritableColumns(model, data)
 	query := p.db.NewUpdate().Table(tableName).SetMap(data).Where(fmt.Sprintf("%s = ?", QuoteIdent(reflection.GetPrimaryKeyName(tableName))), id)
 
 	result, err := query.Exec(ctx)

pkg/common/recursive_crud_test.go

@@ -99,6 +99,7 @@ func (m *mockInsertQuery) Value(column string, value interface{}) InsertQuery {
 	return m
 }
 func (m *mockInsertQuery) OnConflict(action string) InsertQuery { return m }
+func (m *mockInsertQuery) ExcludeColumn(columns ...string) InsertQuery { return m }
 func (m *mockInsertQuery) Returning(columns ...string) InsertQuery { return m }
 func (m *mockInsertQuery) Exec(ctx context.Context) (Result, error) {
 	m.db.insertCalls = append(m.db.insertCalls, m.values)
@@ -131,6 +132,7 @@ func (m *mockUpdateQuery) SetMap(values map[string]interface{}) UpdateQuery {
 	return m
 }
 func (m *mockUpdateQuery) Where(condition string, args ...interface{}) UpdateQuery { return m }
+func (m *mockUpdateQuery) ExcludeColumn(columns ...string) UpdateQuery { return m }
 func (m *mockUpdateQuery) Returning(columns ...string) UpdateQuery { return m }
 func (m *mockUpdateQuery) Exec(ctx context.Context) (Result, error) {
 	// Record the update call