enh: PGVECTOR_CREATE_EXTENSION env var

backend/open_webui/retrieval/vector/dbs/pgvector.py

@@ -37,6 +37,7 @@ from open_webui.retrieval.vector.main import (
 from open_webui.config import (
     PGVECTOR_DB_URL,
     PGVECTOR_INITIALIZE_MAX_VECTOR_LENGTH,
+    PGVECTOR_CREATE_EXTENSION,
     PGVECTOR_PGCRYPTO,
     PGVECTOR_PGCRYPTO_KEY,
     PGVECTOR_POOL_SIZE,
@@ -112,6 +113,7 @@ class PgvectorClient(VectorDBBase):
         try:
             # Ensure the pgvector extension is available
             # Use a conditional check to avoid permission issues on Azure PostgreSQL
+            if PGVECTOR_CREATE_EXTENSION:
                 self.session.execute(
                     text(
                         """