refactor: Integrate Flyway for database migrations and simplify Docker Compose and tenant configurations.

backend/src/main/java/com/magistr/app/Application.java

@@ -2,10 +2,11 @@ package com.magistr.app;
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration;
 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
 import org.springframework.scheduling.annotation.EnableScheduling;
 
-@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
+@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, FlywayAutoConfiguration.class})
 @EnableScheduling
 public class Application {
 

backend/src/main/java/com/magistr/app/config/tenant/TenantConfigWatcher.java

@@ -120,46 +120,37 @@ public class TenantConfigWatcher {
     }
 
     /**
-     * Инициализирует БД нового тенанта: проверяет наличие таблиц,
-     * если нет — выполняет init.sql.
+     * Выполняет миграции Flyway для конкретного тенанта пи подключении.
+     * Если БД уже существует, но история Flyway пуста — 
+     * делает baseline (считает V1_init.sql уже выполненным).
      */
     public void initDatabaseForTenant(TenantConfig tenant) {
         String domain = tenant.getDomain();
         try {
             TenantContext.setCurrentTenant(domain);
 
-            if (needsInit()) {
-                log.info("[{}] Tables not found — executing init.sql...", domain);
-                executeInitSql();
-                log.info("[{}] init.sql executed successfully", domain);
-            } else {
-                log.info("[{}] Tables already exist, skipping init", domain);
+            log.info("[{}] Starting Flyway migrations...", domain);
+            
+            // Получаем DataSource конкретно для этого тенанта
+            javax.sql.DataSource tenantDs = routingDataSource.getResolvedDataSources().get(domain);
+            if (tenantDs == null) {
+                // Если ещё не resolve'нулся (первый запуск), берём обёртку
+                tenantDs = dataSource;
             }
+
+            org.flywaydb.core.Flyway flyway = org.flywaydb.core.Flyway.configure()
+                    .dataSource(tenantDs)
+                    .baselineOnMigrate(true)
+                    .baselineVersion("1")
+                    .load();
+
+            flyway.migrate();
+            log.info("[{}] Flyway migrations completed successfully", domain);
+
         } catch (Exception e) {
-            log.error("[{}] DB init failed: {}", domain, e.getMessage());
+            log.error("[{}] Flyway migration failed: {}", domain, e.getMessage());
         } finally {
             TenantContext.clear();
         }
     }
-
-    private boolean needsInit() {
-        try (Connection conn = dataSource.getConnection();
-             ResultSet rs = conn.getMetaData().getTables(null, null, "users", new String[]{"TABLE"})) {
-            return !rs.next();
-        } catch (Exception e) {
-            return true;
-        }
-    }
-
-    private void executeInitSql() throws Exception {
-        String sql;
-        try (InputStream is = new ClassPathResource("init.sql").getInputStream();
-             BufferedReader reader = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8))) {
-            sql = reader.lines().collect(Collectors.joining("\n"));
-        }
-        try (Connection conn = dataSource.getConnection();
-             Statement stmt = conn.createStatement()) {
-            stmt.execute(sql);
-        }
-    }
 }

backend/src/main/java/com/magistr/app/config/tenant/TenantDataSourceConfig.java

@@ -101,12 +101,12 @@ public class TenantDataSourceConfig implements WebMvcConfigurer {
         em.setPackagesToScan("com.magistr.app.model");
 
         HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
-        vendorAdapter.setGenerateDdl(true);
+        vendorAdapter.setGenerateDdl(false);
         vendorAdapter.setDatabasePlatform("org.hibernate.dialect.PostgreSQLDialect");
         em.setJpaVendorAdapter(vendorAdapter);
 
         Map<String, Object> props = new HashMap<>();
-        props.put("hibernate.hbm2ddl.auto", "update");
+        props.put("hibernate.hbm2ddl.auto", "none");
         props.put("hibernate.show_sql", "false");
         em.setJpaPropertyMap(props);