fix: add server_name to moderation_actions for full context retention

Denormalize guild name alongside username so the moderation dashboard
shows both TARGET and server even after message table purges.
Migration 0018. Frontend displays 'username · server_name' in TARGET.

services/discord-gateway/drizzle/migrations/0018_add_server_name_to_moderation_actions.sql

@@ -0,0 +1 @@
+ALTER TABLE "moderation_actions" ADD COLUMN "server_name" text;

services/discord-gateway/drizzle/migrations/meta/_journal.json

@@ -127,6 +127,13 @@
       "when": 1787810000000,
       "tag": "0017_add_username_to_moderation_actions",
       "breakpoints": true
+    },
+    {
+      "idx": 18,
+      "version": "7",
+      "when": 1787820000000,
+      "tag": "0018_add_server_name_to_moderation_actions",
+      "breakpoints": true
     }
   ]
 }

services/discord-gateway/src/modules/ai-moderation/autoDeleteManager.ts

@@ -188,6 +188,7 @@ function hasPermissionApi(channel: unknown): channel is {
 async function logAutoDeleteAttempt(
   message: MessageRecord,
   result: AutoDeleteResult,
+  serverName?: string | null,
 ): Promise<void> {
   try {
     await messageStore.createModerationAction({
@@ -198,6 +199,7 @@ async function logAutoDeleteAttempt(
       reason: result.reason,
       ...verdictToActionFields(message),
       username: message.username,
+      server_name: serverName ?? null,
       executed_by: "auto-delete-manager",
       status: result.deleted
         ? "executed"
@@ -264,6 +266,7 @@ export async function attemptAutoDeleteFlaggedMessage(
               "nickname melanggar aturan server (offensive_username); pesan dibiarkan",
             ...verdictToActionFields(message),
             username: message.username,
+            server_name: null,
             executed_by: "auto-delete-manager",
             status: resetOk ? "executed" : "failed",
             error: resetOk ? null : "nickname_reset_failed",
@@ -384,7 +387,7 @@ export async function attemptAutoDeleteFlaggedMessage(
         skipped: true,
         reason: "dry_run",
       };
-      await logAutoDeleteAttempt(message, result);
+      await logAutoDeleteAttempt(message, result, guild.name);
       logger.info(
         { messageId: message.id, channelId },
         "Auto-delete dry-run: would delete flagged message",
@@ -416,7 +419,7 @@ export async function attemptAutoDeleteFlaggedMessage(
       skipped: false,
       reason: "deleted",
     };
-    await logAutoDeleteAttempt(message, result);
+    await logAutoDeleteAttempt(message, result, guild.name);
     logger.info(
       { messageId: message.id, channelId },
       "Auto-deleted AI-flagged message",

services/discord-gateway/src/modules/command-handler/moderation.handler.ts

@@ -104,6 +104,7 @@ export class ModerationHandler {
           | "ban_user",
         reason: payload.reason ?? null,
         username: null,
+        server_name: null,
         executed_by: payload.executed_by ?? "command-handler",
         status: "executed",
         error: null,

services/discord-gateway/src/shared/database/schema.ts

@@ -643,6 +643,7 @@ export const pgModerationActionsTable = pgTable(
     evidence: pgText("evidence"), // JSON array of short quoted snippets
     policy_version: pgText("policy_version"), // rules.ts policy version string
     username: pgText("username"), // denormalized from messages table for retention safety
+    server_name: pgText("server_name"), // denormalized guild name for retention safety
   },
   (table) => ({
     messageIdIdx: pgIndex("idx_moderation_actions_message_id").on(

services/discord-gateway/src/shared/database/schema/messages.ts

@@ -60,6 +60,7 @@ export const pgModerationActionsTable = pgTable(
     evidence: pgText("evidence"), // JSON array of short quoted snippets
     policy_version: pgText("policy_version"), // rules.ts policy version string
     username: pgText("username"), // denormalized from messages table for retention safety
+    server_name: pgText("server_name"), // denormalized guild name for retention safety
   },
   (table) => ({
     messageIdIdx: pgIndex("idx_moderation_actions_message_id").on(

services/discord-gateway/src/shared/moderation-types.ts

@@ -209,6 +209,7 @@ export interface ModerationAction {
   action_type: ModerationActionType;
   reason: string | null;
   username: string | null;
+  server_name: string | null;
   executed_by: string | null;
   status: "pending" | "executed" | "failed";
   error: string | null;