Checking social handle uniqueness case insensitively.

migrations/20260725010000_actors_socials_handle_lower_unique.js

@@ -0,0 +1,40 @@
+exports.up = async function(knex) {
+	const duplicates = await knex.raw(`
+		SELECT actor_id, platform, lower(handle) AS handle_lower, COUNT(*) AS count
+		FROM actors_socials
+		WHERE handle IS NOT NULL
+		GROUP BY actor_id, platform, lower(handle)
+		HAVING COUNT(*) > 1
+	`);
+
+	if (duplicates.rows.length > 0) {
+		console.log(`Deduping ${duplicates.rows.length} actors_socials handle group(s)`, duplicates.rows.map((row) => `${row.actor_id}/${row.platform}/${row.handle_lower} (${row.count})`).join(', '));
+	}
+
+	await knex.raw(`
+		DELETE FROM actors_socials
+		WHERE id IN (
+			SELECT id FROM (
+				SELECT
+					id,
+					ROW_NUMBER() OVER (
+						PARTITION BY actor_id, platform, lower(handle)
+						ORDER BY (handle = lower(handle)) ASC, created_at ASC
+					) AS rn
+				FROM actors_socials
+				WHERE handle IS NOT NULL
+			) ranked
+			WHERE rn > 1
+		);
+
+		ALTER TABLE actors_socials DROP CONSTRAINT actors_social_actor_id_platform_handle_unique;
+		CREATE UNIQUE INDEX actors_socials_actor_id_platform_handle_lower_unique ON actors_socials (actor_id, platform, lower(handle));
+	`);
+};
+
+exports.down = async function(knex) {
+	await knex.raw(`
+		DROP INDEX actors_socials_actor_id_platform_handle_lower_unique;
+		ALTER TABLE actors_socials ADD CONSTRAINT actors_social_actor_id_platform_handle_unique UNIQUE (actor_id, platform, handle);
+	`);
+};