feat: extensible search engine with person entities (FTS5/tsvector)

crates/adapters/sqlite/migrations/0015_search.sql

@@ -0,0 +1,36 @@
+-- Persons table. tmdb_person_id is stored for efficient joins with existing
+-- movie_cast and movie_crew tables (which use tmdb_person_id as their person key).
+CREATE TABLE IF NOT EXISTS persons (
+    id             TEXT PRIMARY KEY,        -- UUID (PersonId)
+    external_id    TEXT NOT NULL UNIQUE,    -- "tmdb:12345"
+    tmdb_person_id INTEGER UNIQUE,          -- parsed from external_id for fast joins
+    name           TEXT NOT NULL,
+    known_for_department TEXT,
+    profile_path   TEXT
+);
+
+CREATE INDEX IF NOT EXISTS idx_persons_external ON persons (external_id);
+CREATE INDEX IF NOT EXISTS idx_persons_tmdb_id  ON persons (tmdb_person_id);
+
+-- FTS5 full-text search table for movies.
+-- movie_id is UNINDEXED (stored but not tokenised for text search).
+-- release_year and language are UNINDEXED (used only for structured filters).
+CREATE VIRTUAL TABLE IF NOT EXISTS movies_fts USING fts5(
+    movie_id     UNINDEXED,
+    title,
+    director,
+    overview,
+    genres,
+    keywords,
+    cast_names,
+    crew_names,
+    release_year UNINDEXED,
+    language     UNINDEXED
+);
+
+-- FTS5 full-text search table for people.
+CREATE VIRTUAL TABLE IF NOT EXISTS people_fts USING fts5(
+    person_id            UNINDEXED,
+    name,
+    known_for_department UNINDEXED
+);