Fix UNIQUE constraint on active personal access tokens per session

Author: reivilibre

crates/storage-pg/migrations/20251023134634_personal_access_tokens_unique_fix.sql

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+-- Copyright 2025 Element Creations Ltd.
+--
+-- SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+-- Please see LICENSE in the repository root for full details.
+
+
+-- Fix a faulty constraint.
+-- The condition was incorrectly specified as `revoked_at IS NOT NULL`
+-- when `revoked_at IS NULL` was meant.
+
+DROP INDEX personal_access_tokens_personal_session_id_idx;
+
+-- Ensure we can only have one active personal access token in each family.
+CREATE UNIQUE INDEX ON personal_access_tokens (personal_session_id) WHERE revoked_at IS NULL;