fix(migrations): correct migration version from v4.0-to-v4.1 to v4.1-to-v4.2

The migration was incorrectly named as v4.0→v4.1 but was actually performing
the v4.1→v4.2 migration (moving thresholds from UPS-level to action-level).
This meant users upgrading from v4.1 would not get their configs migrated.

Changes:
- Renamed migration file from migration-v4.0-to-v4.1.ts to migration-v4.1-to-v4.2.ts
- Updated class name from MigrationV4_0ToV4_1 to MigrationV4_1ToV4_2
- Updated fromVersion from '4.0' to '4.1'
- Updated toVersion from '4.1' to '4.2'
- Updated shouldRun() to check for config.version === '4.1'
- Updated all imports and exports to reference the new class name
- Updated comments and log messages to reflect v4.1→v4.2 migration

ts/migrations/index.ts

@@ -8,4 +8,4 @@ export { BaseMigration } from './base-migration.ts';
 export { MigrationRunner } from './migration-runner.ts';
 export { MigrationV1ToV2 } from './migration-v1-to-v2.ts';
 export { MigrationV3ToV4 } from './migration-v3-to-v4.ts';
-export { MigrationV4_0ToV4_1 } from './migration-v4.0-to-v4.1.ts';
+export { MigrationV4_1ToV4_2 } from './migration-v4.1-to-v4.2.ts';

ts/migrations/migration-runner.ts

@@ -1,7 +1,7 @@
 import { BaseMigration } from './base-migration.ts';
 import { MigrationV1ToV2 } from './migration-v1-to-v2.ts';
 import { MigrationV3ToV4 } from './migration-v3-to-v4.ts';
-import { MigrationV4_0ToV4_1 } from './migration-v4.0-to-v4.1.ts';
+import { MigrationV4_1ToV4_2 } from './migration-v4.1-to-v4.2.ts';
 import { logger } from '../logger.ts';
 
 /**
@@ -18,8 +18,8 @@ export class MigrationRunner {
     this.migrations = [
       new MigrationV1ToV2(),
       new MigrationV3ToV4(),
-      new MigrationV4_0ToV4_1(),
-      // Add future migrations here (v4.2, v4.3, etc.)
+      new MigrationV4_1ToV4_2(),
+      // Add future migrations here (v4.3, v4.4, etc.)
     ];
 
     // Sort by version order to ensure they run in sequence

ts/migrations/migration-v4.1-to-v4.2.ts

@@ -2,7 +2,7 @@ import { BaseMigration } from './base-migration.ts';
 import { logger } from '../logger.ts';
 
 /**
- * Migration from v4.0 to v4.1
+ * Migration from v4.1 to v4.2
  *
  * Major changes:
  * 1. Moves thresholds from UPS level to action level
@@ -10,23 +10,24 @@ import { logger } from '../logger.ts';
  * 3. Adds empty actions array to UPS devices without actions
  * 4. Adds empty actions array to groups
  *
- * Transforms v4.0 format:
+ * Transforms v4.1 format (with UPS-level thresholds):
  * {
- *   version: "4.0",
+ *   version: "4.1",
  *   upsDevices: [
  *     {
  *       id: "ups-1",
  *       name: "UPS 1",
  *       snmp: {...},
  *       thresholds: { battery: 60, runtime: 20 },  // UPS-level
- *       groups: []
+ *       groups: [],
+ *       actions: []
  *     }
  *   ]
  * }
  *
- * To v4.1 format:
+ * To v4.2 format (with action-level thresholds):
  * {
- *   version: "4.1",
+ *   version: "4.2",
  *   upsDevices: [
  *     {
  *       id: "ups-1",
@@ -37,7 +38,7 @@ import { logger } from '../logger.ts';
  *         {
  *           type: "shutdown",
  *           thresholds: { battery: 60, runtime: 20 },
- *           onlyOnThresholdViolation: true,
+ *           triggerMode: "onlyThresholds",
  *           shutdownDelay: 5
  *         }
  *       ]
@@ -45,28 +46,28 @@ import { logger } from '../logger.ts';
  *   ]
  * }
  */
-export class MigrationV4_0ToV4_1 extends BaseMigration {
-  readonly fromVersion = '4.0';
-  readonly toVersion = '4.1';
+export class MigrationV4_1ToV4_2 extends BaseMigration {
+  readonly fromVersion = '4.1';
+  readonly toVersion = '4.2';
 
   async shouldRun(config: any): Promise<boolean> {
-    // Run if config is version 4.0 or missing version with v4 structure
-    if (config.version === '4.0') {
+    // Run if config is version 4.1
+    if (config.version === '4.1') {
       return true;
     }
 
-    // Also run if config has upsDevices with thresholds at UPS level (v4.0 format)
+    // Also run if config has upsDevices with thresholds at UPS level (v4.1 format)
     if (config.upsDevices && config.upsDevices.length > 0) {
       const firstDevice = config.upsDevices[0];
-      // v4.0 has thresholds at UPS level, v4.1 has them in actions
-      return firstDevice.thresholds !== undefined && firstDevice.actions === undefined;
+      // v4.1 has thresholds at UPS level, v4.2 has them in actions
+      return firstDevice.thresholds !== undefined;
     }
 
     return false;
   }
 
   async migrate(config: any): Promise<any> {
-    logger.info(`${this.getName()}: Migrating v4.0 config to v4.1 format...`);
+    logger.info(`${this.getName()}: Migrating v4.1 config to v4.2 format...`);
     logger.dim(`  - Moving thresholds from UPS level to action level`);
     logger.dim(`  - Creating default shutdown actions from existing thresholds`);