chore(library): squash pre-RC migrations into single 001_initial baseline (#919)

* chore(library): squash pre-RC migrations into single 001_initial baseline

Library SQLite never shipped in a release, so fold migrations 002–008 into
001_initial.sql and drop the dev-only mood-facts purge (009). Sets
LIBRARY_DB_SCHEMA_VERSION to 1 for the RC baseline; analysis migrations
unchanged.

* docs: note library migration squash in CHANGELOG and credits (PR #919)

* fix(library): keep migration SQL files on disk after RC baseline squash

Restore 002–009 as historical dev migration scripts. Runner still ships
only 001 for fresh installs; existing DBs with applied versions are
unchanged. Drop credits/CHANGELOG note for this small internal change.

src-tauri/crates/psysonic-library/migrations/001_initial.sql

@@ -45,6 +45,7 @@ CREATE TABLE sync_state (
   initial_sync_cursor_json TEXT NOT NULL DEFAULT '{}',
   sync_phase               TEXT NOT NULL DEFAULT 'idle',
   last_error               TEXT,
+  n1_bulk_unreliable       INTEGER NOT NULL DEFAULT 0,
   PRIMARY KEY (server_id, library_scope)
 );
 
@@ -108,6 +109,7 @@ CREATE TABLE track (
   content_hash         TEXT,
   server_updated_at    INTEGER,
   server_created_at    INTEGER,
+  resync_gen           INTEGER NOT NULL DEFAULT 0,
   deleted              INTEGER NOT NULL DEFAULT 0,
   synced_at            INTEGER NOT NULL,
   raw_json             TEXT NOT NULL,
@@ -233,6 +235,19 @@ CREATE TABLE canonical_enrichment_link (
   FOREIGN KEY (canonical_id) REFERENCES canonical_track(id)
 );
 
+CREATE TABLE play_session (
+  id               INTEGER PRIMARY KEY AUTOINCREMENT,
+  server_id        TEXT NOT NULL,
+  track_id         TEXT NOT NULL,
+  started_at_ms    INTEGER NOT NULL,
+  listened_sec     REAL NOT NULL,
+  position_max_sec REAL NOT NULL,
+  completion       TEXT NOT NULL,
+  end_reason       TEXT NOT NULL,
+  FOREIGN KEY (server_id, track_id) REFERENCES track(server_id, id),
+  CHECK (completion IN ('partial', 'full'))
+);
+
 CREATE INDEX idx_track_album   ON track(server_id, album_id)               WHERE deleted = 0;
 CREATE INDEX idx_track_artist  ON track(server_id, artist_id)              WHERE deleted = 0;
 CREATE INDEX idx_track_updated ON track(server_id, server_updated_at DESC) WHERE deleted = 0;
@@ -245,3 +260,36 @@ CREATE INDEX idx_track_artifact_lookup ON track_artifact(server_id, track_id, ar
 CREATE INDEX idx_track_offline_hash    ON track_offline(server_id, content_hash);
 CREATE INDEX idx_track_id_history_new  ON track_id_history(server_id, new_id);
 CREATE INDEX idx_canonical_identity_lookup ON canonical_identity(kind, value);
+
+CREATE INDEX idx_track_remap_path
+  ON track(server_id, server_path)
+  WHERE deleted = 0 AND server_path IS NOT NULL AND server_path != '';
+
+CREATE INDEX idx_track_remap_hash
+  ON track(server_id, content_hash)
+  WHERE deleted = 0 AND content_hash IS NOT NULL AND content_hash != '';
+
+CREATE INDEX idx_track_title
+  ON track(server_id, title COLLATE NOCASE)
+  WHERE deleted = 0;
+
+CREATE INDEX idx_track_genre
+  ON track(server_id, genre COLLATE NOCASE)
+  WHERE deleted = 0 AND genre IS NOT NULL;
+
+CREATE INDEX idx_track_year
+  ON track(server_id, year)
+  WHERE deleted = 0 AND year IS NOT NULL;
+
+CREATE INDEX idx_play_session_server_time
+  ON play_session(server_id, started_at_ms DESC);
+
+CREATE INDEX idx_play_session_track
+  ON play_session(server_id, track_id, started_at_ms DESC);
+
+CREATE INDEX idx_play_session_started
+  ON play_session(started_at_ms DESC);
+
+CREATE INDEX idx_track_fact_mood_tag
+  ON track_fact(server_id, fact_kind, value_text, track_id)
+  WHERE fact_kind = 'mood_tag';

src-tauri/crates/psysonic-library/src/store.rs

@@ -9,7 +9,7 @@ use tauri::Manager;
 
 /// Current head of the embedded migrations. Bump each time a new
 /// `migrations/NNN_*.sql` is added.
-pub const LIBRARY_DB_SCHEMA_VERSION: i64 = 9;
+pub const LIBRARY_DB_SCHEMA_VERSION: i64 = 1;
 
 /// Lowest applied schema version the current code can advance from purely
 /// additively. If a DB carries a version below this, the breaking-bump hook
@@ -22,33 +22,10 @@ pub const LIBRARY_DB_SCHEMA_VERSION: i64 = 9;
 pub const LIBRARY_DB_MIN_COMPATIBLE_VERSION: i64 = 1;
 
 pub(crate) const INITIAL_SQL: &str = include_str!("../migrations/001_initial.sql");
-const MIGRATION_002_N1_BULK_UNRELIABLE: &str =
-    include_str!("../migrations/002_n1_bulk_unreliable.sql");
-const MIGRATION_003_TRACK_REMAP_INDEXES: &str =
-    include_str!("../migrations/003_track_remap_indexes.sql");
-const MIGRATION_004_TRACK_TITLE_INDEX: &str =
-    include_str!("../migrations/004_track_title_index.sql");
-const MIGRATION_005_TRACK_GENRE_YEAR_INDEXES: &str =
-    include_str!("../migrations/005_track_genre_year_indexes.sql");
-const MIGRATION_006_PLAY_SESSION: &str = include_str!("../migrations/006_play_session.sql");
-const MIGRATION_007_RESYNC_GEN: &str = include_str!("../migrations/007_resync_gen.sql");
-const MIGRATION_008_MOOD_TAG_INDEX: &str = include_str!("../migrations/008_mood_tag_index.sql");
-const MIGRATION_009_PURGE_MOOD_FACTS: &str =
-    include_str!("../migrations/009_purge_mood_facts.sql");
 
 /// Embedded migrations. Ordered ascending by `version`; the runner sorts
 /// defensively before applying so the source order can stay readable.
-const MIGRATIONS: &[(i64, &str)] = &[
+const MIGRATIONS: &[(i64, &str)] = &[(1, INITIAL_SQL)];
-    (1, INITIAL_SQL),
-    (2, MIGRATION_002_N1_BULK_UNRELIABLE),
-    (3, MIGRATION_003_TRACK_REMAP_INDEXES),
-    (4, MIGRATION_004_TRACK_TITLE_INDEX),
-    (5, MIGRATION_005_TRACK_GENRE_YEAR_INDEXES),
-    (6, MIGRATION_006_PLAY_SESSION),
-    (7, MIGRATION_007_RESYNC_GEN),
-    (8, MIGRATION_008_MOOD_TAG_INDEX),
-    (9, MIGRATION_009_PURGE_MOOD_FACTS),
-];
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub(crate) enum MigrationOutcome {
@@ -553,6 +530,7 @@ mod tests {
             "track_fact",
             "track_id_history",
             "track_offline",
+            "play_session",
         ] {
             assert!(
                 tables.iter().any(|t| t == expected),