Allow granular per-chat reminder configuration

migrations/2024-01-23-085502_multiple_reminder_types/down.sql

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+DELETE FROM reminders WHERE reminder_time == NULL;
+
+ALTER TABLE reminders DROP reminder_time;
+ALTER TABLE reminders RENAME reminder_delta_hours TO days_ahead;
+
+-- Convert days_ahead from hours to days
+UPDATE reminders SET days_ahead = days_ahead / 24;

migrations/2024-01-23-085502_multiple_reminder_types/up.sql

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+ALTER TABLE reminders RENAME days_ahead TO reminder_delta_hours;
+ALTER TABLE reminders ADD reminder_time TEXT;
+
+-- Convert reminder_delta_hours from days to hours
+UPDATE reminders SET reminder_delta_hours = reminder_delta_hours * 24;
+
+UPDATE reminders SET reminder_time='10:00';