Rename migration files to be sequential (#674)

Until now they began with the revision_id which made it hard to
spot which migrations were sequential

Author: aponcedeleonch

alembic.ini

@@ -15,5 +15,11 @@ prepend_sys_path = .
 # version_locations. The default within new alembic.ini files is "os", which uses os.pathsep.
 version_path_separator = os  # Use os.pathsep.
 
+# template used to generate migration file names
+file_template = %%(year)d_%%(month).2d_%%(day).2d_%%(hour).2d%%(minute).2d-%%(rev)s_%%(slug)s
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+timezone = UTC
+
 # DB connection string
 sqlalchemy.url = sqlite:///codegate_volume/db/codegate.db