fix(alerting): harden V12 migration IT against shared container state

- Replace hard-coded 'u1' user_id with per-test UUID to prevent PK collision on re-runs
- Add @AfterEach null-safe cleanup for environments and users rows
- Use containsExactlyInAnyOrder for enum assertions to catch misspelled names
- Slug suffix on environment insert avoids slug uniqueness conflicts on re-runs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cameleer-server-app/src/test/java/com/cameleer/server/app/alerting/storage/V12MigrationIT.java

@@ -1,11 +1,21 @@
 package com.cameleer.server.app.alerting.storage;
 
 import com.cameleer.server.app.AbstractPostgresIT;
+import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Test;
 import static org.assertj.core.api.Assertions.assertThat;
 
 class V12MigrationIT extends AbstractPostgresIT {
 
+    private java.util.UUID testEnvId;
+    private String testUserId;
+
+    @AfterEach
+    void cleanup() {
+        if (testEnvId != null) jdbcTemplate.update("DELETE FROM environments WHERE id = ?", testEnvId);
+        if (testUserId != null) jdbcTemplate.update("DELETE FROM users WHERE user_id = ?", testUserId);
+    }
+
     @Test
     void allAlertingTablesAndEnumsExist() {
         var tables = jdbcTemplate.queryForList(
@@ -22,38 +32,47 @@ class V12MigrationIT extends AbstractPostgresIT {
             "('severity_enum','condition_kind_enum','alert_state_enum'," +
             "'target_kind_enum','notification_status_enum')",
             String.class);
-        assertThat(enums).hasSize(5);
+        assertThat(enums).containsExactlyInAnyOrder(
+            "severity_enum", "condition_kind_enum", "alert_state_enum",
+            "target_kind_enum", "notification_status_enum");
     }
 
     @Test
     void deletingEnvironmentCascadesAlertingRows() {
-        var envId = java.util.UUID.randomUUID();
+        testEnvId = java.util.UUID.randomUUID();
+        testUserId = java.util.UUID.randomUUID().toString();
+
         jdbcTemplate.update(
             "INSERT INTO environments (id, slug, display_name) VALUES (?, ?, ?)",
-            envId, "test-cascade-env", "Test Cascade Env");
+            testEnvId, "test-cascade-env-" + testEnvId, "Test Cascade Env");
         jdbcTemplate.update(
-            "INSERT INTO users (user_id, provider, email) " +
+            "INSERT INTO users (user_id, provider, email) VALUES (?, ?, ?)",
-            "VALUES (?, ?, ?)", "u1", "local", "a@b.test");
+            testUserId, "local", "test@example.com");
+
         var ruleId = java.util.UUID.randomUUID();
         jdbcTemplate.update(
             "INSERT INTO alert_rules (id, environment_id, name, severity, condition_kind, condition, " +
             "notification_title_tmpl, notification_message_tmpl, created_by, updated_by) " +
-            "VALUES (?, ?, 'r', 'WARNING', 'AGENT_STATE', '{}'::jsonb, 't', 'm', 'u1', 'u1')",
+            "VALUES (?, ?, 'r', 'WARNING', 'AGENT_STATE', '{}'::jsonb, 't', 'm', ?, ?)",
-            ruleId, envId);
+            ruleId, testEnvId, testUserId, testUserId);
+
         var instanceId = java.util.UUID.randomUUID();
         jdbcTemplate.update(
             "INSERT INTO alert_instances (id, rule_id, rule_snapshot, environment_id, state, severity, " +
             "fired_at, context, title, message) VALUES (?, ?, '{}'::jsonb, ?, 'FIRING', 'WARNING', " +
             "now(), '{}'::jsonb, 't', 'm')",
-            instanceId, ruleId, envId);
+            instanceId, ruleId, testEnvId);
 
-        jdbcTemplate.update("DELETE FROM environments WHERE id = ?", envId);
+        jdbcTemplate.update("DELETE FROM environments WHERE id = ?", testEnvId);
 
         assertThat(jdbcTemplate.queryForObject(
             "SELECT count(*) FROM alert_rules WHERE environment_id = ?",
-            Integer.class, envId)).isZero();
+            Integer.class, testEnvId)).isZero();
         assertThat(jdbcTemplate.queryForObject(
             "SELECT count(*) FROM alert_instances WHERE environment_id = ?",
-            Integer.class, envId)).isZero();
+            Integer.class, testEnvId)).isZero();
+
+        // testEnvId already deleted; null it so @AfterEach doesn't attempt a no-op delete
+        testEnvId = null;
     }
 }