Add migration and introduce dirty flag handling

internal/repository/migrations/mysql/01_init-schema.up.sql

@@ -36,7 +36,7 @@ CREATE TABLE IF NOT EXISTS job (
     );
 
 CREATE TABLE IF NOT EXISTS tag (
-    id       INTEGER AUTO_INCREMENT PRIMARY KEY,
+    id       INTEGER PRIMARY KEY,
     tag_type VARCHAR(255) NOT NULL,
     tag_name VARCHAR(255) NOT NULL,
     UNIQUE (tag_type, tag_name));

internal/repository/migrations/mysql/07_fix-tag-id.down.sql

@@ -0,0 +1 @@
+ALTER TABLE tag MODIFY id INTEGER;

internal/repository/migrations/mysql/07_fix-tag-id.up.sql

@@ -0,0 +1 @@
+ALTER TABLE tag MODIFY id INTEGER AUTO_INCREMENT;