Initiate Postgres connection pool on startup

src/main/java/database/PgDatabaseConnection.java

@@ -0,0 +1,28 @@
+package database;
+
+import database.note.NoteRowMapper;
+import org.jdbi.v3.core.Handle;
+import org.jdbi.v3.core.Jdbi;
+
+import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.SQLException;
+
+public class PgDatabaseConnection {
+    private final DataSource dataSource;
+    private final Jdbi jdbi;
+
+    public PgDatabaseConnection(DataSource dataSource) {
+        this.dataSource = dataSource;
+        this.jdbi = Jdbi.create(dataSource)
+                .registerRowMapper(new NoteRowMapper()); // TODO: configure jdbi elsewhere
+    }
+
+    public Connection getConnection() throws SQLException {
+        return dataSource.getConnection();
+    }
+
+    public Handle getHandle() {
+        return jdbi.open();
+    }
+}

src/main/java/database/migration/FlywayRunner.java

@@ -4,6 +4,8 @@ import database.PgDatabaseConfig;
 import org.flywaydb.core.Flyway;
 import org.flywaydb.core.api.FlywayException;
 
+import java.util.Map;
+
 public class FlywayRunner {
     private final PgDatabaseConfig dbConfig;
 
@@ -18,6 +20,10 @@ public class FlywayRunner {
                 .createSchemas(true)
                 .connectRetries(10)
                 .connectRetriesInterval(5)
+                .placeholders(Map.of(
+                        "server-username", dbConfig.username(),
+                        "server-password", dbConfig.password())
+                )
                 .load();
         flyway.migrate();
     }

src/main/java/database/note/NoteDao.java

@@ -1,6 +1,7 @@
 package database.note;
 
 import database.DaoException;
+import database.PgDatabaseConnection;
 import model.Note;
 import org.jdbi.v3.core.Handle;
 import org.jdbi.v3.core.JdbiException;
@@ -10,6 +11,11 @@ import java.util.List;
 import java.util.Optional;
 
 public class NoteDao {
+    private final PgDatabaseConnection connection;
+
+    public NoteDao(PgDatabaseConnection connection) {
+        this.connection = connection;
+    }
 
     public void save(Note note) {
         try (Handle handle = DatabaseConnection.getHandle()) {