rewrite migrations

+ delete older migrations ... oops
+ change migratrions from "migrations" to "dbmigrations"
+ restructure migrations, order them based on release version
+ add a utils/decorators.py file with a coroutine decorator

app/migrations/__init__.py

@@ -6,14 +6,25 @@ Reads and applies the latest database migrations.
 PLEASE NOTE: OLDER MIGRATIONS CAN NEVER BE DELETED.
 ONLY MODIFY OLD MIGRATIONS FOR BUG FIXES OR ENHANCEMENTS ONLY
 [TRY NOT TO MODIFY BEHAVIOR, UNLESS YOU KNOW WHAT YOU'RE DOING].
+
+PS: Fuck that! Do what you want.
 """
 
 
 from app.db.sqlite.migrations import MigrationManager
 from app.logger import log
+from app.migrations import v1_3_0
 
-from .main import main_db_migrations
-from .userdata import userdata_db_migrations
+migrations = [
+    [
+        # v1.3.0
+        v1_3_0.RemovePlaylistArtistHashes,
+        v1_3_0.AddSettingsToPlaylistTable,
+        v1_3_0.AddLastUpdatedToTrackTable,
+        v1_3_0.MovePlaylistsAndFavoritesTo10BitHashes,
+        v1_3_0.RemoveAllTracks,
+    ]
+]
 
 
 def apply_migrations():
@@ -21,28 +32,14 @@ def apply_migrations():
     Applies the latest database migrations.
     """
 
-    userdb_version = MigrationManager.get_userdatadb_postinit_version()
-    maindb_version = MigrationManager.get_maindb_postinit_version()
+    version = MigrationManager.get_version()
 
-    # No migrations to run
-    if userdb_version == 0 and maindb_version == 0:
-        return
+    if version != len(migrations):
+        # run migrations after the previous migration version
+        for migration in migrations[(version - 1) :]:
+            for m in migration:
+                log.info("Running new migration: %s", m.name)
+                m.migrate()
 
-    for migration in main_db_migrations:
-        if migration.version > maindb_version:
-            log.info("Running new MAIN-DB post-init migration: %s", migration.name)
-            migration.migrate()
-
-    for migration in userdata_db_migrations:
-        if migration.version > userdb_version:
-            log.info("Running new USERDATA-DB post-init migration: %s", migration.name)
-            migration.migrate()
-
-
-def set_postinit_migration_versions():
-    """
-    Sets the post-init migration versions.
-    """
-    # TODO: Don't forget to remove the zeros below when you add a valid migration 👇.
-    MigrationManager.set_maindb_postinit_version(0)
-    MigrationManager.set_userdatadb_postinit_version(0)
+    # update migration version
+    MigrationManager.set_version(len(migrations))