fix: Remove creation of tables for PGVector

As PGVector is used as a vector database it doesn't need to create tables based on models

Fix COG-678

cognee/infrastructure/databases/vector/pgvector/create_db_and_tables.py

@@ -2,19 +2,11 @@ from ..get_vector_engine import get_vector_engine, get_vectordb_config
 from sqlalchemy import text
 
 
-# Note: Variable is used like a caching mechanism to not recreate tables in case they were already created
-created=False
-
 async def create_db_and_tables():
     vector_config = get_vectordb_config()
     vector_engine = get_vector_engine()
 
     if vector_config.vector_db_provider == "pgvector":
-        global created
-        if not created:
-            await vector_engine.create_database()
-            created = True
-
         async with vector_engine.engine.begin() as connection:
             await connection.execute(text("CREATE EXTENSION IF NOT EXISTS vector;"))