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+# Troubleshooting Migrations
+
+In some cases, HedgeDoc might apply migrations without correctly saving the progress.
+In these cases, HedgeDoc will refuse to start with “already exists”-errors like
+`ERROR: type "enum_Notes_permission" already exists`.
+
+To fix these issues, manual intervention in the database is required:
+
+1. Make sure you have a way to edit the database directly. For SQLite, PostgreSQL and MariaDB/MySQL, you can use the
+ respective command-line tools `sqlite3`, `psql` and `mysql`.
+2. Get the name of the failing migration and append `.js` to it.
+ For example, if you encounter this error
+ ```
+ == 20180306150303-fix-enum: migrating =======
+
+ ERROR: type "enum_Notes_permission" already exists
+ ```
+ the name of the failed migration would be `20180306150303-fix-enum.js`.
+3. Make sure HedgeDoc does not run and insert the name into the `SequelizeMeta` table.
+ Ensure your database shell is connected to the HedgeDoc database. The SQL-statement may look like this:
+ ```sql
+ INSERT INTO "SequelizeMeta" (name) VALUES ('20180306150303-fix-enum.js');
+ ```
+4. Start HedgeDoc again and observe if it starts correctly. It may be necessary to repeat this process
+ and insert multiple migrations into the `SequelizeMeta` table.