feat: refactor document and FAQ index removal logic, introducing cleanup helper functions for improved structure and readability

internal/ai/rag/index_cleanup_helpers.go

@@ -0,0 +1,54 @@
+package rag
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+
+	"cs-agent/internal/ai/rag/vectordb"
+	"cs-agent/internal/models"
+
+	"github.com/mlogclub/simple/common/strs"
+	"github.com/mlogclub/simple/sqls"
+)
+
+func collectChunkVectorIDs(chunks []models.KnowledgeChunk) []string {
+	vectorIDs := make([]string, 0, len(chunks))
+	for _, chunk := range chunks {
+		if strs.IsNotBlank(chunk.VectorID) {
+			vectorIDs = append(vectorIDs, chunk.VectorID)
+		}
+	}
+	return vectorIDs
+}
+
+func (s *index) deleteChunkVectors(ctx context.Context, vectorIDs []string) error {
+	if len(vectorIDs) == 0 {
+		return nil
+	}
+	provider := vectordb.GetProvider()
+	if provider == nil {
+		return fmt.Errorf("vectordb provider not initialized")
+	}
+	return provider.DeleteVectors(ctx, s.getCollectionName(), vectorIDs)
+}
+
+func deleteChunksByCondition(column string, value int64) error {
+	return sqls.WithTransaction(func(ctx *sqls.TxContext) error {
+		return ctx.Tx.Where(column+" = ?", value).Delete(&models.KnowledgeChunk{}).Error
+	})
+}
+
+func (s *index) cleanupKnowledgeBaseChunks(ctx context.Context, knowledgeBaseID int64, chunks []models.KnowledgeChunk) error {
+	vectorIDs := collectChunkVectorIDs(chunks)
+	if err := s.deleteChunkVectors(ctx, vectorIDs); err != nil {
+		return fmt.Errorf("failed to delete vectors for knowledge base %d before rebuild: %w", knowledgeBaseID, err)
+	}
+	if err := deleteChunksByCondition("knowledge_base_id", knowledgeBaseID); err != nil {
+		return fmt.Errorf("failed to clear chunks before rebuild: %w", err)
+	}
+	slog.Info("Knowledge base index storage reset",
+		"knowledge_base_id", knowledgeBaseID,
+		"collection", s.getCollectionName())
+	return nil
+}