Run PRAGMA optimize in destroy method

docs/api/destroy.md

@@ -16,6 +16,8 @@ export const { destroy } = new SQLocal('database.sqlite3');
 
 The `destroy` method takes no arguments. It will return a `Promise` to close the connection to the SQLite database file and then terminate the Web Worker that the `SQLocal` client uses internally to run queries.
 
+It will also execute [`PRAGMA optimize`](https://www.sqlite.org/pragma.html#pragma_optimize) on the database before closing the connection.
+
 Call `destroy` if you want to clean up an `SQLocal` instance because you are finished querying its associated database for the remainder of the session. **Avoid** calling `destroy` after each query and then initializing a new `SQLocal` instance for the next query.
 
 ```javascript

src/processor.ts

@@ -301,8 +301,11 @@ export class SQLocalProcessor {
 	};
 
 	protected destroy = (message: DestroyMessage) => {
-		this.db?.close();
-		this.db = undefined;
+		if (this.db) {
+			this.db.exec({ sql: 'PRAGMA optimize' });
+			this.db.close();
+			this.db = undefined;
+		}
 
 		this.emitMessage({
 			type: 'success',