Task/add index 2 (#2106)

* Add index concurrently for n_hist

* fix

---------

Co-authored-by: William B <[email protected]>

migrations/versions/0444_add_index_n_history2.py

@@ -0,0 +1,40 @@
+"""
+
+Revision ID: 0439_add_index_n_history
+Revises: 0438_sms_templates_msgs_left
+Create Date: 2023-10-05 00:00:00
+
+"""
+from datetime import datetime
+
+from alembic import op
+
+revision = "0444_add_index_n_history2"
+down_revision = "0443_add_apikey_last_used_column"
+
+
+def index_exists(name):
+    connection = op.get_bind()
+    result = connection.execute(
+        "SELECT exists(SELECT 1 from pg_indexes where indexname = '{}') as ix_exists;".format(name)
+    ).first()
+    return result.ix_exists
+
+
+# option 1
+def upgrade():
+    op.execute("COMMIT")
+    if not index_exists("ix_notification_history_api_key_id_created"):
+        op.create_index(
+            op.f("ix_notification_history_api_key_id_created"),
+            "notification_history",
+            ["api_key_id", "created_at"],
+            postgresql_concurrently=True,
+        )
+
+
+def downgrade():
+    op.execute("COMMIT")
+    op.drop_index(
+        op.f("ix_notification_history_api_key_id_created"), table_name="notification_history", postgresql_concurrently=True
+    )