feat: add web push and sadhna tracker

migrations/0028_add_reminder_fields.up.sql

@@ -0,0 +1,14 @@
+-- Sādhana reminder support.
+--
+-- timezone: the user's IANA zone (e.g. "Asia/Kolkata"), reported by the
+-- browser, so reminders fire at their local clock time. Defaults to UTC
+-- until the client reports a real zone.
+--
+-- sadhna_reminders_enabled: per-user opt-out for the daily reminders.
+--
+-- last_{chant,quote}_reminder_on: the UTC date a reminder of that kind was
+-- last sent, so each kind goes out at most once per (UTC) day.
+ALTER TABLE users ADD COLUMN IF NOT EXISTS timezone TEXT NOT NULL DEFAULT 'UTC';
+ALTER TABLE users ADD COLUMN IF NOT EXISTS sadhna_reminders_enabled BOOLEAN NOT NULL DEFAULT TRUE;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS last_chant_reminder_on DATE;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS last_quote_reminder_on DATE;