Implements database, adds profiles

h2/src/main/java/ch/gtache/fro/h2/H2ConfigurationManager.java

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+package ch.gtache.fro.h2;
+
+public class H2ConfigurationManager {
+}

h2/src/main/java/ch/gtache/fro/modules/h2/H2Module.java

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+package ch.gtache.fro.modules.h2;
+
+import dagger.Module;
+import dagger.Provides;
+import jakarta.inject.Singleton;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+/**
+ * Dagger module for H2
+ */
+@Module
+public final class H2Module {
+
+    private H2Module() {
+
+    }
+
+    @Provides
+    @Singleton
+    static Connection providesJdbcConnection() {
+        try {
+            final var connection = DriverManager.getConnection("jdbc:h2:mem:");
+            Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+                try {
+                    connection.close();
+                } catch (final SQLException e) {
+                    throw new RuntimeException("Error closing H2 connection", e);
+                }
+            }));
+            return connection;
+        } catch (final SQLException e) {
+            throw new RuntimeException("Error connecting to H2", e);
+        }
+    }
+}

h2/src/main/java/module-info.java

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+/**
+ * H2 module for the FRO application
+ */
+module ch.gtache.fro.h2 {
+    requires transitive ch.gtache.fro.database;
+    exports ch.gtache.fro.h2;
+    exports ch.gtache.fro.modules.h2;
+}