feat: index public search with FTS5

lib/db.ts

@@ -154,6 +154,24 @@ db.prepare("UPDATE source_members SET role='editor' WHERE role='member'").run();
 db.prepare("INSERT OR IGNORE INTO schema_migrations(version) VALUES(36)").run();
 db.prepare("INSERT OR IGNORE INTO schema_migrations(version) VALUES(37)").run();
 applyColumnMigration(38, "sources", "attachment_archive_after_days", "ALTER TABLE sources ADD COLUMN attachment_archive_after_days INTEGER");
+const ftsSchema = `
+CREATE VIRTUAL TABLE IF NOT EXISTS posts_fts USING fts5(content, tags);
+CREATE TRIGGER IF NOT EXISTS posts_fts_insert AFTER INSERT ON posts BEGIN
+  INSERT INTO posts_fts(rowid,content,tags) VALUES(new.id,new.content,new.tags_json);
+END;
+CREATE TRIGGER IF NOT EXISTS posts_fts_delete AFTER DELETE ON posts BEGIN
+  DELETE FROM posts_fts WHERE rowid=old.id;
+END;
+CREATE TRIGGER IF NOT EXISTS posts_fts_update AFTER UPDATE OF content,tags_json ON posts BEGIN
+  DELETE FROM posts_fts WHERE rowid=old.id;
+  INSERT INTO posts_fts(rowid,content,tags) VALUES(new.id,new.content,new.tags_json);
+END;
+`;
+db.exec(ftsSchema);
+const hasFtsMigration = db.prepare("SELECT 1 FROM schema_migrations WHERE version=39").get();
+if (!hasFtsMigration) { db.prepare("INSERT INTO posts_fts(rowid,content,tags) SELECT id,content,tags_json FROM posts").run(); db.prepare("INSERT INTO schema_migrations(version) VALUES(39)").run(); }
+db.exec("CREATE INDEX IF NOT EXISTS posts_source_visibility_idx ON posts(source_id,visibility,hidden); CREATE INDEX IF NOT EXISTS posts_author_visibility_idx ON posts(author_id,visibility,hidden);");
+db.prepare("INSERT OR IGNORE INTO schema_migrations(version) VALUES(40)").run();
 
 const admin = process.env.ADMIN_USERNAME;
 const adminPassword = process.env.ADMIN_PASSWORD;