fix: isolate application datasource from readonly platform

src/main/java/com/yau/digitalrmb/shared/infrastructure/persistence/ApplicationDataSourceConfig.java

@@ -0,0 +1,20 @@
+package com.yau.digitalrmb.shared.infrastructure.persistence;
+
+import com.zaxxer.hikari.HikariDataSource;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.jdbc.autoconfigure.DataSourceProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+
+@Configuration(proxyBeanMethods = false)
+@EnableConfigurationProperties(DataSourceProperties.class)
+public class ApplicationDataSourceConfig {
+    @Bean(name = "dataSource", destroyMethod = "close")
+    @Primary
+    @ConfigurationProperties("spring.datasource.hikari")
+    public HikariDataSource applicationDataSource(DataSourceProperties properties) {
+        return properties.initializeDataSourceBuilder().type(HikariDataSource.class).build();
+    }
+}

src/test/java/com/yau/digitalrmb/ApplicationContextTest.java

@@ -1,8 +1,10 @@
 package com.yau.digitalrmb;
 
+import com.zaxxer.hikari.HikariDataSource;
 import org.flywaydb.core.Flyway;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.ActiveProfiles;
 
@@ -15,10 +17,25 @@ class ApplicationContextTest {
     @Autowired
     private Flyway flyway;
 
+    @Autowired
+    @Qualifier("dataSource")
+    private HikariDataSource applicationDataSource;
+
+    @Autowired
+    @Qualifier("platformReadOnlyDataSource")
+    private HikariDataSource platformReadOnlyDataSource;
+
     @Test
     void baselineMigrationIsApplied() {
         assertThat(flyway.info().applied())
                 .extracting(migration -> migration.getVersion().getVersion())
                 .contains("0");
     }
+
+    @Test
+    void applicationDatasourceIsSeparateAndWritable() {
+        assertThat(applicationDataSource).isNotSameAs(platformReadOnlyDataSource);
+        assertThat(applicationDataSource.isReadOnly()).isFalse();
+        assertThat(platformReadOnlyDataSource.isReadOnly()).isTrue();
+    }
 }