Add signature verification and lossless event tag storage

priv/repo/migrations/20260314031753_add_events_tags_jsonb.exs

@@ -0,0 +1,24 @@
+defmodule Parrhesia.Repo.Migrations.AddEventsTagsJsonb do
+  use Ecto.Migration
+
+  def up do
+    execute("ALTER TABLE events ADD COLUMN tags jsonb NOT NULL DEFAULT '[]'::jsonb")
+
+    execute("""
+    UPDATE events AS event
+    SET tags = COALESCE(
+      (
+        SELECT jsonb_agg(jsonb_build_array(tag.name, tag.value) ORDER BY tag.idx)
+        FROM event_tags AS tag
+        WHERE tag.event_created_at = event.created_at
+          AND tag.event_id = event.id
+      ),
+      '[]'::jsonb
+    )
+    """)
+  end
+
+  def down do
+    execute("ALTER TABLE events DROP COLUMN tags")
+  end
+end