Fix edit entity and relation bugs

lightrag/kg/postgres_impl.py

@@ -575,6 +575,41 @@ class PGVectorStorage(BaseVectorStorage):
         except Exception as e:
             logger.error(f"Error deleting relations for entity {entity_name}: {e}")
 
+    async def search_by_prefix(self, prefix: str) -> list[dict[str, Any]]:
+        """Search for records with IDs starting with a specific prefix.
+
+        Args:
+            prefix: The prefix to search for in record IDs
+
+        Returns:
+            List of records with matching ID prefixes
+        """
+        table_name = namespace_to_table_name(self.namespace)
+        if not table_name:
+            logger.error(f"Unknown namespace for prefix search: {self.namespace}")
+            return []
+
+        search_sql = f"SELECT * FROM {table_name} WHERE workspace=$1 AND id LIKE $2"
+        params = {"workspace": self.db.workspace, "prefix": f"{prefix}%"}
+
+        try:
+            results = await self.db.query(search_sql, params, multirows=True)
+            logger.debug(f"Found {len(results)} records with prefix '{prefix}'")
+
+            # Format results to match the expected return format
+            formatted_results = []
+            for record in results:
+                formatted_record = dict(record)
+                # Ensure id field is available (for consistency with NanoVectorDB implementation)
+                if "id" not in formatted_record:
+                    formatted_record["id"] = record["id"]
+                formatted_results.append(formatted_record)
+
+            return formatted_results
+        except Exception as e:
+            logger.error(f"Error during prefix search for '{prefix}': {e}")
+            return []
+
 
 @final
 @dataclass