Create CHANGELOG.md

CHANGELOG.md

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+# Unreleased
+
+These changes are awaiting release:
+
+## Data migrations
+
+This is the first time migrations are being taken place when updating Watcharr, please be mindful of that and **ensure you have your existing database backed up** incase of any errors.
+
+### Backfilling `plays` data from users Activity.
+
+This migration was added so that existing data could be used to fill out how many plays of your media you have. It can't be 100% accurate because it has to make some assumptions, but it can get close and saves you a lot of time.
+
+### Dropping `deleted_at` columns for `watched_seasons` and `watched_episodes` tables since we do not use them.
+
+I noticed that queries (eg for loading your main list) would take an extra ~100ms because we were adding a `deleted_at IS NULL` to them when getting watched seasons/episodes. We don't use the deleted_at column, so I have just removed it from the tables (and queries so we have the speed boost).
+
+### Moving to using WAL journal_mode for our sqlite database, which will grant us improvements in all areas.
+
+Most database operations will be much faster now and more concurrent use of the database is now possible.
+
+#### Important Note About Backups
+
+You will notice that the database now comprises of three files: `watcharr.db` (which has always been there) and `watcharr.db-wal`, `watcharr.db-shm` (which are new).
+
+If you backup your database by copying the .db file (while your server is stopped of course), you should also copy the `watcharr.db-wal` file since it can contain database content. You can ignore the `watcharr.db-shm` file if you want.
+
+## Added
+
+- DB: Add custom migrations support.
+- Activity: New `CountAsPlay` property for tracking media total plays (this will speed up counting plays since we'll no longer rely on text searches in the db).
+  - Migration: Backfill media plays data from existing user activity, so no one has to start from `0` plays when they already have data we can use to get their total plays.
+- Add link to names of top crew members.
+- Return `Plays` in WatchedDto where used.
+- Show `plays` count for media in `MyReview` component.
+- Activity: Show icon for activity that counts as a play.
+
+## Changed
+
+- Moved db to WAL journal_mode.
+- WatchedUpdateRequest: Manually validate instead of using complex struct tags.
+  - Now properly validating WatchedStatus.
+
+## Fixed
+
+- import: myanimelist: Don't import start/finish dates when they are empty.
+- Star and Play icons color.
+- Activity: Fixed automation tooltip going out of bounds by moving it to top.
+
+## Removed
+
+- Drop `deleted_at` columns for watched episode/season tables.
+- Removed `AddActivity` (POST /activity) endpoint.