Auto-create account in both MySQL and PG

src/main/java/database/account/AccountRepository.java

@@ -0,0 +1,31 @@
+package database.account;
+
+import database.PgDatabaseConnection;
+import org.jdbi.v3.core.Handle;
+
+public class AccountRepository {
+    private final PgDatabaseConnection connection;
+
+    public AccountRepository(PgDatabaseConnection connection) {
+        this.connection = connection;
+    }
+
+    public Account getByName(String name) {
+        return null; // TODO
+    }
+
+    public Integer insert(Account account) {
+        String sql = """
+                INSERT INTO account (name, password, birthdate)
+                VALUES (:name, :password, :birthdate)""";
+        try (Handle handle = connection.getHandle()) {
+            return handle.createUpdate(sql)
+                    .bind("name", account.name())
+                    .bind("password", account.password())
+                    .bind("birthdate", account.birthdate())
+                    .executeAndReturnGeneratedKeys("id")
+                    .mapTo(Integer.class)
+                    .one();
+        }
+    }
+}