Switch back to PostgreSQL

Author: AlekSi

.gitignore

@@ -8,6 +8,7 @@ To see it in action:
 ```
 docker run -d -p 5432:5432 -e POSTGRES_PASSWORD=password postgres
 ```
+
 2. Start example with:
 ```
 git clone https://github.com/FerretDB/embedded-example.git
@@ -19,19 +20,20 @@ go run main.go
 
 ```
 $ mongosh
-Current Mongosh Log ID: 642b78c47cc3d068be6a3032
-Connecting to:          mongodb://127.0.0.1:27017/?directConnection=true&serverSelectionTimeoutMS=2000&appName=mongosh+1.8.0
-Using MongoDB:          6.0.42
-Using Mongosh:          1.8.0
+Current Mongosh Log ID: 66a36fe425b4669aac9f9769
+Connecting to:          mongodb://127.0.0.1:27017/?directConnection=true&serverSelectionTimeoutMS=2000&appName=mongosh+2.2.12
+Using MongoDB:          7.0.42
+Using Mongosh:          2.2.12
 
 For mongosh info see: https://docs.mongodb.com/mongodb-shell/
 
 ------
    The server generated these startup warnings when booting
-   2023-04-04T01:09:24.993Z: Powered by FerretDB unknown and PostgreSQL 15.2.
-   2023-04-04T01:09:24.993Z: Please star us on GitHub: https://github.com/FerretDB/FerretDB.
+   2024-07-26T09:44:04.726Z: Powered by FerretDB unknown and PostgreSQL 16.3.
+   2024-07-26T09:44:04.726Z: Please star us on GitHub: https://github.com/FerretDB/FerretDB.
 ------
 
 test> db.test.find()
-[ { _id: ObjectId("642b78be03eb5aed54f767bc"), hello: 'world' } ]
+[ { _id: ObjectId('66a36fdbf693bdd9d33739e8'), hello: 'world' } ]
+test>
 ```

README.md

@@ -50,14 +50,16 @@ func main() {
 		Listener: ferretdb.ListenerConfig{
 			TCP: "127.0.0.1:27017",
 		},
-		Handler:   "sqlite",
-		SQLiteURL: "file:data/",
+		Handler:       "postgresql",
+		PostgreSQLURL: "postgres://postgres:password@127.0.0.1:5432/postgres",
 	})
 	if err != nil {
 		log.Fatal(err)
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
 	done := make(chan error)
 
 	go func() {
@@ -69,7 +71,8 @@ func main() {
 
 	runExampleClient(uri)
 
-	cancel()
+	// cancel()
+
 	err = <-done
 	if err != nil {
 		log.Fatal(err)