From 4f2c53b8d4a619cbeb1ea09f756573a75db22755 Mon Sep 17 00:00:00 2001
From: Disha Prakash <dishaprakash@google.com>
Date: Thu, 14 Aug 2025 12:09:00 +0000
Subject: [PATCH] chore: Add deprecation warning for PGVector

---
 langchain_postgres/vectorstores.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/langchain_postgres/vectorstores.py b/langchain_postgres/vectorstores.py
index a3743e4b..3ca99500 100644
--- a/langchain_postgres/vectorstores.py
+++ b/langchain_postgres/vectorstores.py
@@ -429,6 +429,13 @@ def __init__(
         self._async_engine: Optional[AsyncEngine] = None
         self._async_init = False
 
+        warnings.warn(
+            "PGVector is being deprecated and will be removed in the future. "
+            "Please migrate to PGVectorStore. "
+            "Refer to the migration guide at [https://github.com/langchain-ai/langchain-postgres/blob/main/examples/migrate_pgvector_to_pgvectorstore.md] for details.",
+            PendingDeprecationWarning,
+        )
+
         if isinstance(connection, str):
             if async_mode:
                 self._async_engine = create_async_engine(