add chat system

Overlord-Server/src/db.ts

@@ -293,6 +293,81 @@ db.run(
   `CREATE INDEX IF NOT EXISTS idx_auto_deploy_runs_ts ON auto_deploy_runs(ts DESC);`,
 );
 
+db.run(`
+  CREATE TABLE IF NOT EXISTS chat_messages (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id INTEGER NOT NULL,
+    username TEXT NOT NULL,
+    user_role TEXT NOT NULL,
+    message TEXT NOT NULL,
+    created_at INTEGER NOT NULL
+  );
+`);
+db.run(
+  `CREATE INDEX IF NOT EXISTS idx_chat_messages_created_at ON chat_messages(created_at DESC);`,
+);
+
+export type ChatMessageRecord = {
+  id: number;
+  userId: number;
+  username: string;
+  userRole: string;
+  message: string;
+  createdAt: number;
+};
+
+export function insertChatMessage(userId: number, username: string, userRole: string, message: string): ChatMessageRecord {
+  const createdAt = Date.now();
+  const result = db.run(
+    `INSERT INTO chat_messages (user_id, username, user_role, message, created_at) VALUES (?, ?, ?, ?, ?)`,
+    userId, username, userRole, message, createdAt,
+  );
+  const id = Number((result as any).lastInsertRowid);
+  return { id, userId, username, userRole, message, createdAt };
+}
+
+export function getChatHistory(before?: number, limit: number = 50, retentionMs?: number): ChatMessageRecord[] {
+  const maxLimit = Math.min(Math.max(1, limit), 200);
+  const cutoff = retentionMs && retentionMs > 0 ? Date.now() - retentionMs : 0;
+  let rows: any[];
+  if (before) {
+    if (cutoff > 0) {
+      rows = db.query<any>(
+        `SELECT id, user_id, username, user_role, message, created_at FROM chat_messages WHERE created_at < ? AND created_at > ? ORDER BY created_at DESC LIMIT ?`,
+      ).all(before, cutoff, maxLimit);
+    } else {
+      rows = db.query<any>(
+        `SELECT id, user_id, username, user_role, message, created_at FROM chat_messages WHERE created_at < ? ORDER BY created_at DESC LIMIT ?`,
+      ).all(before, maxLimit);
+    }
+  } else {
+    if (cutoff > 0) {
+      rows = db.query<any>(
+        `SELECT id, user_id, username, user_role, message, created_at FROM chat_messages WHERE created_at > ? ORDER BY created_at DESC LIMIT ?`,
+      ).all(cutoff, maxLimit);
+    } else {
+      rows = db.query<any>(
+        `SELECT id, user_id, username, user_role, message, created_at FROM chat_messages ORDER BY created_at DESC LIMIT ?`,
+      ).all(maxLimit);
+    }
+  }
+  return rows.map((r: any) => ({
+    id: r.id,
+    userId: r.user_id,
+    username: r.username,
+    userRole: r.user_role,
+    message: r.message,
+    createdAt: r.created_at,
+  })).reverse();
+}
+
+export function deleteExpiredChatMessages(retentionMs: number): number {
+  if (retentionMs <= 0) return 0;
+  const cutoff = Date.now() - retentionMs;
+  const result = db.run(`DELETE FROM chat_messages WHERE created_at < ?`, cutoff);
+  return Number((result as any).changes ?? 0);
+}
+
 db.run(`
   CREATE TABLE IF NOT EXISTS shared_files (
     id TEXT PRIMARY KEY,
@@ -1164,6 +1239,15 @@ export function getClientMetricsSummaryForUser(userId: number): ClientMetricsSum
   };
 }
 
+export function getOnlineClientCountForUser(userId: number): number {
+  const row = db
+    .query<{ online: number }>(
+      `SELECT SUM(CASE WHEN online=1 THEN 1 ELSE 0 END) as online FROM clients WHERE built_by_user_id = ?`,
+    )
+    .get(userId);
+  return Number(row?.online) || 0;
+}
+
 export function countBuildsForUser(userId: number): number {
   const row = db
     .query<{ c: number }>(`SELECT COUNT(*) as c FROM builds WHERE built_by_user_id = ?`)