fix: Ensure accurate Total Count and correct Limit=0 handling

This commit finalizes the complex querying logic:
- **Refactor `GetAll` (sqlite.go):** Reworks the internal logic to ensure the total number of matching records (`totalCount`) is calculated via a separate COUNT query *before* applying LIMIT/OFFSET.
- **Corrected Pagination:** Adds an explicit check in `GetAll` to return an empty `items` list when `limit=0`, while still reporting the correct `totalCount`.
- **API Handler Update:** Consumes the accurate `totalCount` returned by the Store layer and includes it in the final API response under the `totalItems` field.

internal/api/handlers.go

@@ -1,3 +1,4 @@
+// upupa_dataist_ir/internal/api/handlers.go
 package api
 
 import (
@@ -108,7 +109,7 @@ func (a *API) GetAllRecordsHandler(w http.ResponseWriter, r *http.Request) {
 		offset = 0
 	}
 
-	records, err := a.Records.GetAll(collection.ID, finalFilters, orderBy, limit, offset)
+	records, totalItems, err := a.Records.GetAll(collection.ID, finalFilters, orderBy, limit, offset)
 	if err != nil {
 		log.Printf("Error retrieving records: %v", err)
 		http.Error(w, "Failed to retrieve records", http.StatusInternalServerError)
@@ -120,7 +121,7 @@ func (a *API) GetAllRecordsHandler(w http.ResponseWriter, r *http.Request) {
 
 	response := map[string]interface{}{
 		"items":      records,
-		"totalItems": len(records),
+		"totalItems": totalItems,
 		"limit":      limit,
 		"offset":     offset,
 		"orderBy":    orderBy,

internal/store/repository.go

@@ -1,4 +1,4 @@
-// internal/store/repository.go
+// internal/store/repository
 package store
 
 import "upupa_dataist_ir/pkg/models"
@@ -10,9 +10,7 @@ type CollectionRepository interface {
 
 type RecordRepository interface {
 	CreateRecord(r models.Record) (models.Record, error)
-
-	GetAll(collectionID string, filters map[string]interface{}, orderBy string, limit, offset int) ([]models.Record, error)
-
+	GetAll(collectionID string, filters map[string]interface{}, orderBy string, limit, offset int) ([]models.Record, int, error)
 	GetByID(collectionID, recordID string) (models.Record, error)
 	Update(r models.Record) error
 	Delete(collectionID, recordID string) error

internal/store/sqlite.go

@@ -1,3 +1,4 @@
+// upupa_dataist_ir/internal/store/sqlite.go
 package store
 
 import (
@@ -96,15 +97,14 @@ func (s *SQLiteStore) CreateRecord(r models.Record) (models.Record, error) {
 	return s.GetByID(r.CollectionID, r.ID)
 }
 
-func (s *SQLiteStore) GetAll(collectionID string, filters map[string]interface{}, orderBy string, limit, offset int) ([]models.Record, error) {
+func (s *SQLiteStore) GetAll(collectionID string, filters map[string]interface{}, orderBy string, limit, offset int) ([]models.Record, int, error) {
 
 	baseQuery := `SELECT id, collection_id, created, updated, data FROM records WHERE collection_id = ?`
 
 	args := []interface{}{collectionID}
 
+	filterClause := ""
 	if len(filters) > 0 {
-		filterClause := ""
-
 		for key, value := range filters {
 			field, op, err := parseFilterKey(key)
 			if err != nil {
@@ -117,23 +117,32 @@ func (s *SQLiteStore) GetAll(collectionID string, filters map[string]interface{}
 			filterClause += fmt.Sprintf(" AND %s %s ?", caster, op)
 			args = append(args, value)
 		}
-
-		baseQuery += filterClause
 	}
 
+	countQuery := "SELECT COUNT(*) FROM records WHERE collection_id = ?" + filterClause
+	var totalCount int
+	err := s.db.QueryRow(countQuery, args...).Scan(&totalCount)
+	if err != nil {
+		return nil, 0, err
+	}
+
+	if limit == 0 {
+		return []models.Record{}, totalCount, nil
+	}
+
+	baseQuery += filterClause
+
 	sortClause := " ORDER BY created DESC"
 	if orderBy != "" {
 		sortClause = buildOrderClause(orderBy)
 	}
 	baseQuery += sortClause
 
-	if limit > 0 {
-		baseQuery += fmt.Sprintf(" LIMIT %d OFFSET %d", limit, offset)
-	}
+	baseQuery += fmt.Sprintf(" LIMIT %d OFFSET %d", limit, offset)
 
 	rows, err := s.db.Query(baseQuery, args...)
 	if err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 	defer rows.Close()
 
@@ -147,12 +156,12 @@ func (s *SQLiteStore) GetAll(collectionID string, filters map[string]interface{}
 
 		err := rows.Scan(&r.ID, &r.CollectionID, &r.Created, &r.Updated, &dataStr)
 		if err != nil {
-			return nil, err
+			return nil, 0, err
 		}
 
 		data, err := unmarshalRecordData(dataStr)
 		if err != nil {
-			return nil, err
+			return nil, 0, err
 		}
 
 		r.Data = data
@@ -160,10 +169,10 @@ func (s *SQLiteStore) GetAll(collectionID string, filters map[string]interface{}
 	}
 
 	if err := rows.Err(); err != nil {
-		return nil, err
+		return nil, 0, err
 	}
 
-	return records, nil
+	return records, totalCount, nil
 }
 
 func (s *SQLiteStore) GetByID(collectionID, recordID string) (models.Record, error) {