feat: Added migrations for removing duplication of tags

Author: kushagra0902

migrations/20260419_140000_normalize_parameterized_deduplication.js

@@ -0,0 +1,31 @@
+exports.up = async function (knex) {
+  await knex.raw(`
+    WITH ranked AS (
+      SELECT
+        id,
+        row_number() OVER (
+          PARTITION BY event_pubkey, event_kind, jsonb_build_array(COALESCE(event_deduplication->>0, ''))
+          ORDER BY event_created_at DESC, event_id ASC
+        ) AS row_rank
+      FROM events
+      WHERE event_kind >= 30000
+        AND event_kind < 40000
+    )
+    DELETE FROM events AS e
+    USING ranked AS r
+    WHERE e.id = r.id
+      AND r.row_rank > 1;
+  `)
+
+  await knex.raw(`
+    UPDATE events
+    SET event_deduplication = jsonb_build_array(COALESCE(event_deduplication->>0, ''))
+    WHERE event_kind >= 30000
+      AND event_kind < 40000
+      AND event_deduplication IS DISTINCT FROM jsonb_build_array(COALESCE(event_deduplication->>0, ''));
+  `)
+}
+
+exports.down = async function () {
+  // Irreversible data migration.
+}