fix(sql): backfill whatsapp chat_id in compat init

tests/test_sql_init_compat.py

@@ -42,7 +42,6 @@ def test_init_sql_schema_backfills_whatsapp_message_runtime_columns():
                 CREATE TABLE whatsapp_messages (
                   id INTEGER PRIMARY KEY AUTOINCREMENT,
                   message_id VARCHAR(64) NOT NULL UNIQUE,
-                  chat_id VARCHAR(128) NOT NULL,
                   text TEXT NOT NULL,
                   payload_json TEXT NOT NULL,
                   created_at VARCHAR(64) NOT NULL
@@ -58,6 +57,7 @@ def test_init_sql_schema_backfills_whatsapp_message_runtime_columns():
     indexes = {item["name"] for item in inspector.get_indexes("whatsapp_messages")}
 
     assert "thread_id" in columns
+    assert "chat_id" in columns
     assert "interaction_id" in columns
     assert "customer_id" in columns
     assert "delivery_status" in columns