(todo): Add extra metrics for stats.

v6 -> v7 data migration.
Use soft deletion for tasks.
Remove task expiry.
Migrate `complete` field to `completed_at`.

data/migration/v6-v7/migration.sql

@@ -0,0 +1,18 @@
+-- Add deletion column to tasklist entries
+-- Add completed_at column to the tasklist entries, replacing complete
+
+
+ALTER TABLE tasklist
+  ADD COLUMN completed_at TIMESTAMPTZ,
+  ADD COLUMN deleted_at TIMESTAMPTZ,
+  ALTER COLUMN created_at TYPE TIMESTAMPTZ USING created_at AT TIME ZONE 'UTC',
+  ALTER COLUMN last_updated_at TYPE TIMESTAMPTZ USING created_at AT TIME ZONE 'UTC';
+
+UPDATE tasklist SET deleted_at = NOW() WHERE last_updated_at < NOW() - INTERVAL '24h';
+UPDATE tasklist SET completed_at = last_updated_at WHERE complete;
+
+ALTER TABLE tasklist
+  DROP COLUMN complete;
+
+
+-- Mark all tasklist entries older than a day as deleted