Add db revision for notifications dispatched column

lib/galaxy/model/migrations/alembic/versions_gxy/303a5583a030_add_dispatched_column_to_notifications.py

@@ -0,0 +1,55 @@
+"""add dispatched column to notifications
+
+Revision ID: 303a5583a030
+Revises: 55f02fd8ab6c
+Create Date: 2024-04-04 11:45:54.018829
+
+"""
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy import (
+    Boolean,
+    Column,
+)
+
+from galaxy.model.database_object_names import build_index_name
+from galaxy.model.migrations.util import (
+    add_column,
+    drop_column,
+    drop_index,
+    transaction,
+)
+
+# revision identifiers, used by Alembic.
+revision = "303a5583a030"
+down_revision = "55f02fd8ab6c"
+branch_labels = None
+depends_on = None
+
+# database object names used in this revision
+table_name = "notification"
+column_name = "dispatched"
+publication_time_column_name = "publication_time"
+index_name = build_index_name(table_name, column_name)
+
+
+def upgrade():
+    with transaction():
+        add_column(
+            table_name,
+            Column(column_name, Boolean(), index=True, nullable=False, default=False, server_default=sa.false()),
+        )
+        # Set as already dispatched any notifications older than the current time to avoid sending them again
+        table = sa.sql.table(
+            table_name,
+            Column(column_name, Boolean()),
+            Column(publication_time_column_name, sa.DateTime()),
+        )
+        op.execute(table.update().where(table.c.publication_time <= sa.func.now()).values(dispatched=True))
+
+
+def downgrade():
+    with transaction():
+        drop_index(index_name, table_name)
+        drop_column(table_name, column_name)