Add last_saved and related fields to the database

migrations/20240310183925_add_last_saved_timestamps.sql

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+-- Add last_saved columns
+
+-- timeline_item
+alter table timeline_item
+    add column last_saved timestamptz;
+
+update timeline_item
+set last_saved = (json ->> 'lastSaved') :: timestamptz
+where last_saved is null;
+
+alter table timeline_item
+    alter column last_saved set not null;
+
+-- place
+
+alter table place
+    add column last_saved timestamptz;
+
+update place
+set last_saved = (json ->> 'lastSaved') :: timestamptz
+where last_saved is null;
+
+alter table place
+    alter column last_saved set not null;
+
+-- Add server_last_updated columns
+
+alter table timeline_item
+    add column server_last_updated timestamptz not null default now();
+
+alter table place
+    add column server_last_updated timestamptz not null default now();