refactor: support closing all connections to a db in Rust

CHANGELOG.md

@@ -0,0 +1,40 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.2.0] - Unreleased
+
+### Breaking Changes
+
+#### Database registration by key
+
+Databases must be registered on the Rust side with a stable key before they can be opened. The frontend and Rust callers open databases by **key**, not filesystem path.
+
+- **`Builder::add_migrations(path, migrator)`** replaced by **`Builder::register_database(key, path, migrator?)`**, which returns `Result`.
+- Added **`Builder::on_setup`** and **`SetupRegistrar`** for runtime path registration (e.g. from `app.path().app_data_dir()`).
+- **`Builder<R>`** is now generic over Tauri `Runtime`; use `Builder::<tauri::Wry>::new()` where a turbofish is required.
+
+#### Frontend API
+
+- First argument to **`Database.load()`** and **`Database.get()`** is a registration **key**, not a path. Passing a path string type-checks but fails at runtime with `PATH_NOT_REGISTERED`.
+- **`Database.get(dbKey)`** is synchronous again; it defers connection until the first operation that requires a loaded database. Use **`Database.load(dbKey, customConfig?)`** to connect eagerly or pass pool configuration.
+- IPC command arguments: **`db`** → **`dbKey`**; attached **`databasePath`** → **`databaseKey`**.
+- **`MigrationEvent`**: adds **`dbKey`**; **`dbPath`** is now an absolute path.
+- **`TransactionToken`**: **`dbPath`** → **`dbKey`**.
+
+#### Rust API
+
+- Added **`Connection`** trait on **`AppHandle`** for Rust-side opens by registration key.
+- **`Builder::build()`** returns **`Result`**; duplicate paths across distinct registration keys fail with **`INVALID_CONFIG`**.
+- File paths must be **absolute** at registration; relative path resolution at load time was removed.
+- Invalid registration paths fail at startup (`INVALID_PATH`, `PATH_TRAVERSAL`); unregistered keys fail at open time (`PATH_NOT_REGISTERED`).
+
+### Added
+
+- Path validation module (`validate.rs`) with canonicalization at registration time.
+- Parent directory auto-creation during registration validation for file paths.
+- CI check that committed `api-iife.js` matches a fresh Rollup build.
+
+### Fixed
+
+- Regenerated `api-iife.js` so all IPC calls use `dbKey` consistently.

Cargo.toml

@@ -47,5 +47,6 @@ futures = "0.3.31"
 tauri-plugin = { version = "2.5.1", features = ["build"] }
 
 [dev-dependencies]
+tauri = { version = "2.9.3", features = ["test"] }
 tempfile = "3.23.0"
 tokio = { version = "1.48.0", features = ["rt-multi-thread", "macros"] }