diff --git a/backend/scripts/2026-03-10-delete-users-without-profile.ts b/backend/scripts/2026-03-10-delete-users-without-profile.ts
new file mode 100644
index 00000000..718de2c8
--- /dev/null
+++ b/backend/scripts/2026-03-10-delete-users-without-profile.ts
@@ -0,0 +1,45 @@
+import chalk from 'chalk'
+import {runScript} from './run-script'
+
+// Deletes all rows in the `users` table whose `id` does not exist
+// in the `user_id` column of the `profiles` table.
+//
+// Processes in batches to avoid long-running transactions / lock contention.
+// Safe to re-run: already-deleted rows simply won't appear in subsequent batches.
+
+runScript(async ({pg}) => {
+  console.log(chalk.cyan('Starting deletion of users with no matching profile…'))
+
+  let totalDeleted = 0
+  let totalFailed = 0
+
+  const rows = await pg.map(
+    `SELECT u.id, u.username
+       FROM users u
+       WHERE NOT EXISTS (
+         SELECT 1 FROM profiles p WHERE p.user_id = u.id
+       )`,
+    [],
+    (row: {id: string; username: string}) => [row.id, row.username],
+  )
+
+  console.log(chalk.blue(`Deleting batch of ${rows.length} orphaned user(s)…`))
+
+  for (const [id, username] of rows) {
+    try {
+      await pg.none(`DELETE FROM users WHERE id = $1`, [id])
+      totalDeleted++
+      console.debug(chalk.green(`  [DELETED] id=${id} (${username})`))
+    } catch (err) {
+      console.error(chalk.red(`  [ERROR]   id=${id} — delete failed:`), err)
+      totalFailed++
+    }
+  }
+
+  console.log(chalk.cyan('\n── Deletion complete ───────────────────────────────'))
+  console.log(chalk.green(`  Deleted : ${totalDeleted}`))
+  console.log(chalk.red(`  Failed  : ${totalFailed}`))
+  console.log(chalk.cyan('────────────────────────────────────────────────────'))
+
+  process.exit(totalFailed > 0 ? 1 : 0)
+})