repo-sqlite: Fix unique constraints for playlist table

Author: uklotzde

crates/repo-sqlite/migrations/0018_playlist/up.sql

@@ -0,0 +1,78 @@
+-- SPDX-FileCopyrightText: Copyright (C) 2018-2025 Uwe Klotz <uwedotklotzatgmaildotcom> et al.
+-- SPDX-License-Identifier: AGPL-3.0-or-later
+
+-- Rename and re-create the table as proposed here: https://www.sqlite.org/lang_altertable.html
+
+-- !!!This pragma is a no-op within a transaction!!!
+-- Migrations are usually run within a transaction.
+PRAGMA foreign_keys = OFF;
+
+CREATE TABLE IF NOT EXISTS playlist_migrate (
+    -- row header (immutable)
+    row_id                   INTEGER PRIMARY KEY,
+    row_created_ms           INTEGER NOT NULL,
+    -- row header (mutable)
+    row_updated_ms           INTEGER NOT NULL,
+    -- entity header (immutable)
+    entity_uid               TEXT NOT NULL, -- ULID
+    -- entity header (mutable)
+    entity_rev               INTEGER NOT NULL, -- RevisionNumber
+    -- relations (immutable)
+    collection_id            INTEGER,
+    -- properties (mutable)
+    title                    TEXT NOT NULL,
+    kind                     TEXT,
+    notes                    TEXT,
+    color_rgb                INTEGER, -- 0xRRGGBB (hex)
+    color_idx                INTEGER, -- palette index
+    flags                    INTEGER NOT NULL, -- bitmask of flags, e.g. locking to prevent unintended modifications
+    --
+    FOREIGN KEY(collection_id) REFERENCES collection(row_id) ON DELETE CASCADE
+) STRICT;
+INSERT INTO playlist_migrate SELECT * FROM playlist;
+DROP TABLE playlist;
+ALTER TABLE playlist_migrate RENAME TO playlist;
+
+-- Verify that all foreign key constraints are still valid.
+PRAGMA foreign_key_check;
+
+-- !!!This pragma is a no-op within a transaction!!!
+-- Migrations are usually run within a transaction.
+PRAGMA foreign_keys = ON;
+
+-- Only the last revision is stored.
+CREATE UNIQUE INDEX udx_playlist_entity_uid ON collection (
+    entity_uid
+);
+
+-- NULL values are considered as distinct for UNIQUE indexes.
+--
+-- See also:
+--  - https://www.sqlite.org/nulls.html
+--  - https://www.sqlite.org/partialindex.html
+CREATE UNIQUE INDEX udx_playlist_collection_id_title_where_kind_null ON playlist (
+    collection_id,
+    title
+) WHERE kind IS NULL;
+CREATE UNIQUE INDEX udx_playlist_collection_id_title_kind ON playlist (
+    collection_id,
+    title,
+    kind
+) WHERE kind IS NOT NULL;
+
+CREATE INDEX idx_playlist_row_created_ms_desc ON playlist (
+    row_created_ms DESC
+);
+
+CREATE INDEX idx_playlist_row_updated_ms_desc ON playlist (
+    row_updated_ms DESC
+);
+
+CREATE INDEX idx_playlist_kind_title ON playlist (
+    kind,
+    title
+) WHERE kind IS NOT NULL;
+
+CREATE INDEX idx_playlist_title ON playlist (
+    title
+);