langchain/vectorstores/pgvector.py/PGVector/__post_init__
class PGVector:    def __post_init__(
        self,
    ) -> None:
        """
        Initialize the store.
        """
        self._conn = self.connect()
        # self.create_vector_extension()
        self.create_tables_if_not_exists()
        self.create_collection()