feat(tasks): add archived status support in API and schema

server/db.js

@@ -775,6 +775,41 @@ const MIGRATIONS = [
       UPDATE calendar_events SET icon = 'tooth' WHERE icon = 'drill';
     `,
   },
+  {
+    version: 25,
+    description: 'Allow archived status for tasks',
+    up: `
+      CREATE TABLE tasks_new (
+        id              INTEGER PRIMARY KEY AUTOINCREMENT,
+        title           TEXT    NOT NULL,
+        description     TEXT,
+        category        TEXT    NOT NULL DEFAULT 'Sonstiges',
+        priority        TEXT    NOT NULL DEFAULT 'none'
+                                CHECK(priority IN ('none', 'low', 'medium', 'high', 'urgent')),
+        status          TEXT    NOT NULL DEFAULT 'open'
+                                CHECK(status IN ('open', 'in_progress', 'done', 'archived')),
+        due_date        TEXT,
+        due_time        TEXT,
+        assigned_to     INTEGER REFERENCES users(id) ON DELETE SET NULL,
+        created_by      INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+        is_recurring    INTEGER NOT NULL DEFAULT 0,
+        recurrence_rule TEXT,
+        parent_task_id  INTEGER REFERENCES tasks(id) ON DELETE CASCADE,
+        created_at      TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now')),
+        updated_at      TEXT    NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%SZ', 'now'))
+      );
+
+      INSERT INTO tasks_new
+      SELECT * FROM tasks;
+
+      DROP TABLE tasks;
+      ALTER TABLE tasks_new RENAME TO tasks;
+
+      CREATE INDEX IF NOT EXISTS idx_tasks_status         ON tasks(status);
+      CREATE INDEX IF NOT EXISTS idx_tasks_assigned       ON tasks(assigned_to);
+      CREATE INDEX IF NOT EXISTS idx_tasks_parent         ON tasks(parent_task_id);
+    `,
+  },
 ];
 
 /**