fix pg_vector extension requires SUPERUSER, but not available on Huawei Cloud RDS (#24093)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/configs/middleware/vdb/pgvector_config.py

@@ -9,6 +9,11 @@ class PGVectorConfig(BaseSettings):
     Configuration settings for PGVector (PostgreSQL with vector extension)
     """
 
+    PGVECTOR_IS_OWNER: Optional[bool] = Field(
+        description="Whether the PGVector is the owner of the database",
+        default=True,
+    )
+
     PGVECTOR_HOST: Optional[str] = Field(
         description="Hostname or IP address of the PostgreSQL server with PGVector extension (e.g., 'localhost')",
         default=None,

api/core/rag/datasource/vdb/pgvector/pgvector.py

@@ -253,6 +253,7 @@ class PGVector(BaseVector):
                 return
 
             with self._get_cursor() as cur:
+                if dify_config.PGVECTOR_IS_OWNER:
                     cur.execute("CREATE EXTENSION IF NOT EXISTS vector")
                 cur.execute(SQL_CREATE_TABLE.format(table_name=self.table_name, dimension=dimension))
                 # PG hnsw index only support 2000 dimension or less