add flyway

Author: Lars Grahmann

backend/build.gradle

@@ -31,6 +31,8 @@ dependencies {
     implementation group: 'org.xerial', name: 'sqlite-jdbc', version: '3.46.1.3'
     implementation 'org.hibernate.orm:hibernate-core:6.4.1.Final'
     implementation 'org.hibernate.orm:hibernate-community-dialects:6.4.1.Final'
+    implementation 'org.flywaydb:flyway-core:9.16.0'
+
     // excel
     implementation 'org.apache.poi:poi:5.2.+'
     implementation 'org.apache.poi:poi-ooxml:5.2.+'

backend/src/main/java/org/eventplanner/config/FlywayConfig.java

@@ -0,0 +1,16 @@
+package org.eventplanner.config;
+
+import org.flywaydb.core.Flyway;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class FlywayConfig {
+
+    @Bean(initMethod = "migrate")
+    public Flyway flyway() {
+        return Flyway.configure()
+            .dataSource("jdbc:sqlite:data/eventplanner.db", null, null)
+            .load();
+    }
+}

backend/src/main/java/org/eventplanner/events/adapter/EventJpaRepository.java

@@ -0,0 +1,26 @@
+package org.eventplanner.events.adapter;
+
+import java.util.List;
+import java.util.Optional;
+
+import org.eventplanner.events.entities.Event;
+import org.eventplanner.events.values.EventKey;
+import org.springframework.lang.NonNull;
+
+public interface EventJpaRepository {
+    @NonNull
+    Optional<Event> findByKey(EventKey key);
+
+    @NonNull
+    List<Event> findAllByYear(int year);
+
+    @NonNull
+    Event create(@NonNull Event event);
+
+    @NonNull
+    Event update(@NonNull Event event);
+
+    void deleteByKey(EventKey key);
+
+    void deleteAllByYear(int year);
+}

backend/src/main/resources/application.yml

@@ -27,6 +27,11 @@ security:
 spring:
   jpa:
     database-platform: org.hibernate.community.dialect.SQLiteDialect
+  flyway:
+    enabled: true
+    locations: classpath:db/migration
+    baseline-on-migrate: true
+    url: jdbc:sqlite:data/eventplanner.db
   security:
     oauth2:
       client:

backend/src/main/resources/db/migration/V1__init.sql

@@ -0,0 +1,18 @@
+-- Create Event table with JSON columns for nested entities
+CREATE TABLE events (
+                        key TEXT PRIMARY KEY,
+                        name TEXT NOT NULL,
+                        state TEXT,
+                        note TEXT,
+                        description TEXT,
+                        start TEXT NOT NULL,
+                        end TEXT NOT NULL,
+                        locations JSON,
+                        slots JSON,
+                        registrations JSON
+);
+
+-- Create index for better query performance on frequently used columns
+CREATE INDEX idx_events_start ON events(start);
+CREATE INDEX idx_events_end ON events(end);
+CREATE INDEX idx_events_state ON events(state);