backend/main.py

@@ -102,6 +102,9 @@ app.include_router(modem_dashboard.router)
 from backend.routers import settings
 app.include_router(settings.router)
 
+from backend.routers import watcher_manager
+app.include_router(watcher_manager.router)
+
 # Projects system routers
 app.include_router(projects.router)
 app.include_router(project_locations.router)

backend/models.py

@@ -66,6 +66,26 @@ class RosterUnit(Base):
     slm_last_check = Column(DateTime, nullable=True)  # Last communication check
 
 
+class WatcherAgent(Base):
+    """
+    Watcher agents: tracks the watcher processes (series3-watcher, thor-watcher)
+    that run on field machines and report unit heartbeats.
+
+    Updated on every heartbeat received from each source_id.
+    """
+    __tablename__ = "watcher_agents"
+
+    id = Column(String, primary_key=True, index=True)        # source_id (hostname)
+    source_type = Column(String, nullable=False)              # series3_watcher | series4_watcher
+    version = Column(String, nullable=True)                   # e.g. "1.4.0"
+    last_seen = Column(DateTime, default=datetime.utcnow)
+    status = Column(String, nullable=False, default="unknown") # ok | pending | missing | error | unknown
+    ip_address = Column(String, nullable=True)
+    log_tail = Column(Text, nullable=True)                    # last N log lines (JSON array of strings)
+    update_pending = Column(Boolean, default=False)           # set True to trigger remote update
+    update_version = Column(String, nullable=True)            # target version to update to
+
+
 class IgnoredUnit(Base):
     """
     Ignored units: units that report but should be filtered out from unknown emitters.

backend/routers/watcher_manager.py

@@ -0,0 +1,129 @@
+"""
+Watcher Manager — admin API for series3-watcher and thor-watcher agents.
+
+Endpoints:
+  GET  /api/admin/watchers                      — list all watcher agents
+  GET  /api/admin/watchers/{agent_id}           — get single agent detail
+  POST /api/admin/watchers/{agent_id}/trigger-update  — flag agent for update
+  POST /api/admin/watchers/{agent_id}/clear-update    — clear update flag
+  GET  /api/admin/watchers/{agent_id}/update-check    — polled by watcher on heartbeat
+
+Page:
+  GET  /admin/watchers                          — HTML admin page
+"""
+
+from datetime import datetime, timezone
+from fastapi import APIRouter, Depends, HTTPException, Request
+from fastapi.responses import HTMLResponse
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+from typing import Optional
+
+from backend.database import get_db
+from backend.models import WatcherAgent
+from backend.templates_config import templates
+
+router = APIRouter(tags=["admin"])
+
+
+# ── helpers ──────────────────────────────────────────────────────────────────
+
+def _agent_to_dict(agent: WatcherAgent) -> dict:
+    last_seen = agent.last_seen
+    if last_seen:
+        # Compute age in minutes (last_seen stored as UTC naive)
+        now_utc = datetime.utcnow()
+        age_minutes = int((now_utc - last_seen).total_seconds() // 60)
+    else:
+        age_minutes = None
+
+    return {
+        "id": agent.id,
+        "source_type": agent.source_type,
+        "version": agent.version,
+        "last_seen": last_seen.isoformat() if last_seen else None,
+        "age_minutes": age_minutes,
+        "status": agent.status,
+        "ip_address": agent.ip_address,
+        "log_tail": agent.log_tail,
+        "update_pending": bool(agent.update_pending),
+        "update_version": agent.update_version,
+    }
+
+
+# ── API routes ────────────────────────────────────────────────────────────────
+
+@router.get("/api/admin/watchers")
+def list_watchers(db: Session = Depends(get_db)):
+    agents = db.query(WatcherAgent).order_by(WatcherAgent.last_seen.desc()).all()
+    return [_agent_to_dict(a) for a in agents]
+
+
+@router.get("/api/admin/watchers/{agent_id}")
+def get_watcher(agent_id: str, db: Session = Depends(get_db)):
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == agent_id).first()
+    if not agent:
+        raise HTTPException(status_code=404, detail="Watcher agent not found")
+    return _agent_to_dict(agent)
+
+
+class TriggerUpdateRequest(BaseModel):
+    version: Optional[str] = None  # target version label (informational)
+
+
+@router.post("/api/admin/watchers/{agent_id}/trigger-update")
+def trigger_update(agent_id: str, body: TriggerUpdateRequest, db: Session = Depends(get_db)):
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == agent_id).first()
+    if not agent:
+        raise HTTPException(status_code=404, detail="Watcher agent not found")
+    agent.update_pending = True
+    agent.update_version = body.version
+    db.commit()
+    return {"ok": True, "agent_id": agent_id, "update_pending": True}
+
+
+@router.post("/api/admin/watchers/{agent_id}/clear-update")
+def clear_update(agent_id: str, db: Session = Depends(get_db)):
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == agent_id).first()
+    if not agent:
+        raise HTTPException(status_code=404, detail="Watcher agent not found")
+    agent.update_pending = False
+    agent.update_version = None
+    db.commit()
+    return {"ok": True, "agent_id": agent_id, "update_pending": False}
+
+
+@router.get("/api/admin/watchers/{agent_id}/update-check")
+def update_check(agent_id: str, db: Session = Depends(get_db)):
+    """
+    Polled by watcher agents on each heartbeat cycle.
+    Returns update_available=True when an update has been triggered via the UI.
+    Automatically clears the flag after the watcher acknowledges it.
+    """
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == agent_id).first()
+    if not agent:
+        return {"update_available": False}
+
+    pending = bool(agent.update_pending)
+
+    if pending:
+        # Clear the flag — the watcher will now self-update
+        agent.update_pending = False
+        db.commit()
+
+    return {
+        "update_available": pending,
+        "version": agent.update_version,
+    }
+
+
+# ── HTML page ─────────────────────────────────────────────────────────────────
+
+@router.get("/admin/watchers", response_class=HTMLResponse)
+def admin_watchers_page(request: Request, db: Session = Depends(get_db)):
+    agents = db.query(WatcherAgent).order_by(WatcherAgent.last_seen.desc()).all()
+    agents_data = [_agent_to_dict(a) for a in agents]
+    return templates.TemplateResponse("admin_watchers.html", {
+        "request": request,
+        "agents": agents_data,
+    })

backend/routes.py

@@ -5,7 +5,7 @@ from datetime import datetime
 from typing import Optional, List
 
 from backend.database import get_db
-from backend.models import Emitter
+from backend.models import Emitter, WatcherAgent
 
 router = APIRouter()
 
@@ -107,6 +107,35 @@ def get_fleet_status(db: Session = Depends(get_db)):
     emitters = db.query(Emitter).all()
     return emitters
 
+# ── Watcher agent upsert helper ───────────────────────────────────────────────
+
+def _upsert_watcher_agent(db: Session, source_id: str, source_type: str,
+                           version: str, ip_address: str, log_tail: str,
+                           status: str) -> None:
+    """Create or update the WatcherAgent row for a given source_id."""
+    agent = db.query(WatcherAgent).filter(WatcherAgent.id == source_id).first()
+    if agent:
+        agent.source_type = source_type
+        agent.version = version
+        agent.last_seen = datetime.utcnow()
+        agent.status = status
+        if ip_address:
+            agent.ip_address = ip_address
+        if log_tail is not None:
+            agent.log_tail = log_tail
+    else:
+        agent = WatcherAgent(
+            id=source_id,
+            source_type=source_type,
+            version=version,
+            last_seen=datetime.utcnow(),
+            status=status,
+            ip_address=ip_address,
+            log_tail=log_tail,
+        )
+        db.add(agent)
+
+
 # series3v1.1 Standardized Heartbeat Schema (multi-unit)
 from fastapi import Request
 
@@ -120,6 +149,11 @@ async def series3_heartbeat(request: Request, db: Session = Depends(get_db)):
 
     source = payload.get("source_id")
     units = payload.get("units", [])
+    version = payload.get("version")
+    log_tail = payload.get("log_tail")  # list of strings or None
+    import json as _json
+    log_tail_str = _json.dumps(log_tail) if log_tail is not None else None
+    client_ip = request.client.host if request.client else None
 
     print("\n=== Series 3 Heartbeat ===")
     print("Source:", source)
@@ -182,13 +216,38 @@ async def series3_heartbeat(request: Request, db: Session = Depends(get_db)):
 
         results.append({"unit": uid, "status": status})
 
+    # Determine overall worst status for the watcher agent row
+    statuses = [r["status"] for r in results]
+    if "Missing" in statuses:
+        agent_status = "missing"
+    elif "Pending" in statuses:
+        agent_status = "pending"
+    elif statuses:
+        agent_status = "ok"
+    else:
+        agent_status = "unknown"
+
+    if source:
+        _upsert_watcher_agent(db, source, "series3_watcher", version,
+                               client_ip, log_tail_str, agent_status)
+
     db.commit()
 
+    # Check if an update has been triggered for this agent
+    update_available = False
+    if source:
+        agent = db.query(WatcherAgent).filter(WatcherAgent.id == source).first()
+        if agent and agent.update_pending:
+            update_available = True
+            agent.update_pending = False
+            db.commit()
+
     return {
         "message": "Heartbeat processed",
         "source": source,
         "units_processed": len(results),
-        "results": results
+        "results": results,
+        "update_available": update_available,
     }
 
 
@@ -221,6 +280,11 @@ async def series4_heartbeat(request: Request, db: Session = Depends(get_db)):
 
     source = payload.get("source", "series4_emitter")
     units = payload.get("units", [])
+    version = payload.get("version")
+    log_tail = payload.get("log_tail")
+    import json as _json
+    log_tail_str = _json.dumps(log_tail) if log_tail is not None else None
+    client_ip = request.client.host if request.client else None
 
     print("\n=== Series 4 Heartbeat ===")
     print("Source:", source)
@@ -276,11 +340,36 @@ async def series4_heartbeat(request: Request, db: Session = Depends(get_db)):
 
         results.append({"unit": uid, "status": status})
 
+    # Determine overall worst status for the watcher agent row
+    statuses = [r["status"] for r in results]
+    if any(s.lower() == "stale" for s in statuses):
+        agent_status = "missing"
+    elif any(s.lower() == "late" for s in statuses):
+        agent_status = "pending"
+    elif statuses:
+        agent_status = "ok"
+    else:
+        agent_status = "unknown"
+
+    if source:
+        _upsert_watcher_agent(db, source, "series4_watcher", version,
+                               client_ip, log_tail_str, agent_status)
+
     db.commit()
 
+    # Check if an update has been triggered for this agent
+    update_available = False
+    if source:
+        agent = db.query(WatcherAgent).filter(WatcherAgent.id == source).first()
+        if agent and agent.update_pending:
+            update_available = True
+            agent.update_pending = False
+            db.commit()
+
     return {
         "message": "Heartbeat processed",
         "source": source,
         "units_processed": len(results),
-        "results": results
+        "results": results,
+        "update_available": update_available,
     }

backend/templates_config.py

@@ -60,6 +60,19 @@ def jinja_same_date(dt1, dt2) -> bool:
         return False
 
 
+def jinja_log_tail_display(s):
+    """Jinja filter: decode a JSON-encoded log tail array into a plain-text string."""
+    if not s:
+        return ""
+    try:
+        lines = _json.loads(s)
+        if isinstance(lines, list):
+            return "\n".join(str(l) for l in lines)
+        return str(s)
+    except Exception:
+        return str(s)
+
+
 # Register Jinja filters and globals
 templates.env.filters["local_datetime"] = jinja_local_datetime
 templates.env.filters["local_time"] = jinja_local_time
@@ -68,3 +81,4 @@ templates.env.filters["fromjson"] = jinja_fromjson
 templates.env.globals["timezone_abbr"] = jinja_timezone_abbr
 templates.env.globals["get_user_timezone"] = get_user_timezone
 templates.env.globals["same_date"] = jinja_same_date
+templates.env.filters["log_tail_display"] = jinja_log_tail_display

migrate_watcher_agents.py

@@ -0,0 +1,37 @@
+"""
+Migration: add watcher_agents table.
+
+Safe to run multiple times (idempotent).
+"""
+
+import sqlite3
+import os
+
+DB_PATH = os.path.join(os.path.dirname(__file__), "data", "seismo.db")
+
+
+def migrate():
+    con = sqlite3.connect(DB_PATH)
+    cur = con.cursor()
+
+    cur.execute("""
+        CREATE TABLE IF NOT EXISTS watcher_agents (
+            id              TEXT PRIMARY KEY,
+            source_type     TEXT NOT NULL,
+            version         TEXT,
+            last_seen       DATETIME,
+            status          TEXT NOT NULL DEFAULT 'unknown',
+            ip_address      TEXT,
+            log_tail        TEXT,
+            update_pending  INTEGER NOT NULL DEFAULT 0,
+            update_version  TEXT
+        )
+    """)
+
+    con.commit()
+    con.close()
+    print("Migration complete: watcher_agents table ready.")
+
+
+if __name__ == "__main__":
+    migrate()

templates/admin_watchers.html

@@ -0,0 +1,273 @@
+{% extends "base.html" %}
+
+{% block title %}Watcher Manager — Admin{% endblock %}
+
+{% block content %}
+<div class="mb-6">
+    <div class="flex items-center gap-3">
+        <h1 class="text-3xl font-bold text-gray-900 dark:text-white">Watcher Manager</h1>
+        <span class="px-2 py-0.5 text-xs font-semibold bg-orange-100 text-orange-700 dark:bg-orange-900 dark:text-orange-300 rounded-full">Admin</span>
+    </div>
+    <p class="text-gray-500 dark:text-gray-400 mt-1 text-sm">
+        Monitor and manage field watcher agents. Data updates on each heartbeat received.
+    </p>
+</div>
+
+<!-- Agent cards -->
+<div id="agent-list" class="space-y-4">
+
+{% if not agents %}
+<div class="bg-white dark:bg-slate-800 rounded-xl shadow p-8 text-center">
+    <svg class="w-12 h-12 mx-auto text-gray-300 dark:text-gray-600 mb-3" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="1.5" d="M9.75 17L9 20l-1 1h8l-1-1-.75-3M3 13h18M5 17h14a2 2 0 002-2V5a2 2 0 00-2-2H5a2 2 0 00-2 2v10a2 2 0 002 2z"/>
+    </svg>
+    <p class="text-gray-500 dark:text-gray-400">No watcher agents have reported in yet.</p>
+    <p class="text-sm text-gray-400 dark:text-gray-500 mt-1">Once a watcher sends its first heartbeat it will appear here.</p>
+</div>
+{% endif %}
+
+{% for agent in agents %}
+<div class="bg-white dark:bg-slate-800 rounded-xl shadow-lg overflow-hidden" id="agent-{{ agent.id | replace(' ', '-') }}">
+
+    <!-- Card header -->
+    <div class="flex items-center justify-between px-6 py-4 border-b border-gray-100 dark:border-slate-700">
+        <div class="flex items-center gap-3">
+            <!-- Status dot -->
+            {% if agent.status == 'ok' %}
+            <span class="status-dot inline-block w-3 h-3 rounded-full bg-green-500 flex-shrink-0"></span>
+            {% elif agent.status == 'pending' %}
+            <span class="status-dot inline-block w-3 h-3 rounded-full bg-yellow-400 flex-shrink-0"></span>
+            {% elif agent.status in ('missing', 'error') %}
+            <span class="status-dot inline-block w-3 h-3 rounded-full bg-red-500 flex-shrink-0"></span>
+            {% else %}
+            <span class="status-dot inline-block w-3 h-3 rounded-full bg-gray-400 flex-shrink-0"></span>
+            {% endif %}
+
+            <div>
+                <h2 class="text-lg font-semibold text-gray-900 dark:text-white">{{ agent.id }}</h2>
+                <div class="flex items-center gap-3 text-xs text-gray-500 dark:text-gray-400 mt-0.5">
+                    <span>{{ agent.source_type }}</span>
+                    {% if agent.version %}
+                    <span class="bg-gray-100 dark:bg-slate-700 px-1.5 py-0.5 rounded font-mono">v{{ agent.version }}</span>
+                    {% endif %}
+                    {% if agent.ip_address %}
+                    <span>{{ agent.ip_address }}</span>
+                    {% endif %}
+                </div>
+            </div>
+        </div>
+
+        <div class="flex items-center gap-3">
+            <!-- Status badge -->
+            {% if agent.status == 'ok' %}
+            <span class="status-badge px-2.5 py-1 text-xs font-semibold rounded-full bg-green-100 text-green-700 dark:bg-green-900 dark:text-green-300">OK</span>
+            {% elif agent.status == 'pending' %}
+            <span class="status-badge px-2.5 py-1 text-xs font-semibold rounded-full bg-yellow-100 text-yellow-700 dark:bg-yellow-900 dark:text-yellow-300">Pending</span>
+            {% elif agent.status == 'missing' %}
+            <span class="status-badge px-2.5 py-1 text-xs font-semibold rounded-full bg-red-100 text-red-700 dark:bg-red-900 dark:text-red-300">Missing</span>
+            {% elif agent.status == 'error' %}
+            <span class="status-badge px-2.5 py-1 text-xs font-semibold rounded-full bg-red-100 text-red-700 dark:bg-red-900 dark:text-red-300">Error</span>
+            {% else %}
+            <span class="status-badge px-2.5 py-1 text-xs font-semibold rounded-full bg-gray-100 text-gray-600 dark:bg-slate-700 dark:text-gray-400">Unknown</span>
+            {% endif %}
+
+            <!-- Trigger Update button -->
+            <button
+                onclick="triggerUpdate('{{ agent.id }}')"
+                class="px-3 py-1.5 text-xs font-medium bg-seismo-orange hover:bg-orange-600 text-white rounded-lg transition-colors"
+                id="btn-update-{{ agent.id | replace(' ', '-') }}"
+            >
+                Trigger Update
+            </button>
+        </div>
+    </div>
+
+    <!-- Meta row -->
+    <div class="px-6 py-3 bg-gray-50 dark:bg-slate-800 border-b border-gray-100 dark:border-slate-700 flex flex-wrap gap-6 text-sm">
+        <div>
+            <span class="text-gray-500 dark:text-gray-400">Last seen</span>
+            <span class="last-seen-value ml-2 font-medium text-gray-800 dark:text-gray-200">
+                {% if agent.last_seen %}
+                    {{ agent.last_seen }}
+                    {% if agent.age_minutes is not none %}
+                    <span class="text-gray-400 dark:text-gray-500 font-normal">({{ agent.age_minutes }}m ago)</span>
+                    {% endif %}
+                {% else %}
+                    Never
+                {% endif %}
+            </span>
+        </div>
+        <div class="update-pending-indicator flex items-center gap-1.5 text-yellow-600 dark:text-yellow-400 {% if not agent.update_pending %}hidden{% endif %}">
+            <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15"/>
+            </svg>
+            <span class="text-xs font-semibold">Update pending — will apply on next heartbeat</span>
+        </div>
+    </div>
+
+    <!-- Log tail -->
+    {% if agent.log_tail %}
+    <div class="px-6 py-4">
+        <div class="flex items-center justify-between mb-2">
+            <span class="text-xs font-semibold text-gray-500 dark:text-gray-400 uppercase tracking-wide">Log Tail</span>
+            <div class="flex items-center gap-3">
+                <button onclick="expandLog('{{ agent.id | replace(' ', '-') }}')" id="expand-{{ agent.id | replace(' ', '-') }}" class="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-200">
+                    Expand
+                </button>
+                <button onclick="toggleLog('{{ agent.id | replace(' ', '-') }}')" class="text-xs text-gray-400 hover:text-gray-600 dark:hover:text-gray-200">
+                    Toggle
+                </button>
+            </div>
+        </div>
+        <pre id="log-{{ agent.id | replace(' ', '-') }}" class="text-xs font-mono bg-gray-900 text-green-400 rounded-lg p-3 overflow-x-auto max-h-96 overflow-y-auto leading-relaxed hidden">{{ agent.log_tail | log_tail_display }}</pre>
+    </div>
+    {% else %}
+    <div class="px-6 py-4 text-xs text-gray-400 dark:text-gray-500 italic">No log data received yet.</div>
+    {% endif %}
+
+</div>
+{% endfor %}
+
+</div>
+
+<!-- Auto-refresh every 30s -->
+<div class="mt-6 text-xs text-gray-400 dark:text-gray-600 text-center">
+    Auto-refreshes every 30 seconds &mdash; or <a href="/admin/watchers" class="underline hover:text-gray-600 dark:hover:text-gray-400">refresh now</a>
+</div>
+
+<script>
+function triggerUpdate(agentId) {
+    if (!confirm('Trigger update for ' + agentId + '?\n\nThe watcher will self-update on its next heartbeat cycle.')) return;
+
+    const safeId = agentId.replace(/ /g, '-');
+    const btn = document.getElementById('btn-update-' + safeId);
+    btn.disabled = true;
+    btn.textContent = 'Sending...';
+
+    fetch('/api/admin/watchers/' + encodeURIComponent(agentId) + '/trigger-update', {
+        method: 'POST',
+        headers: {'Content-Type': 'application/json'},
+        body: JSON.stringify({})
+    })
+    .then(r => r.json())
+    .then(data => {
+        if (data.ok) {
+            btn.textContent = 'Update Queued';
+            btn.classList.remove('bg-seismo-orange', 'hover:bg-orange-600');
+            btn.classList.add('bg-green-600');
+            // Show the pending indicator immediately without a reload
+            const card = document.getElementById('agent-' + safeId);
+            if (card) {
+                const indicator = card.querySelector('.update-pending-indicator');
+                if (indicator) indicator.classList.remove('hidden');
+            }
+        } else {
+            btn.textContent = 'Error';
+            btn.classList.add('bg-red-600');
+            btn.disabled = false;
+        }
+    })
+    .catch(() => {
+        btn.textContent = 'Failed';
+        btn.classList.add('bg-red-600');
+        btn.disabled = false;
+    });
+}
+
+function toggleLog(agentId) {
+    const el = document.getElementById('log-' + agentId);
+    if (el) el.classList.toggle('hidden');
+}
+
+function expandLog(agentId) {
+    const el = document.getElementById('log-' + agentId);
+    const btn = document.getElementById('expand-' + agentId);
+    if (!el) return;
+    el.classList.remove('hidden');
+    if (el.classList.contains('max-h-96')) {
+        el.classList.remove('max-h-96');
+        el.style.maxHeight = 'none';
+        if (btn) btn.textContent = 'Collapse';
+    } else {
+        el.classList.add('max-h-96');
+        el.style.maxHeight = '';
+        if (btn) btn.textContent = 'Expand';
+    }
+}
+
+// Status colors for dot and badge by status value
+const STATUS_DOT = {
+    ok:      'bg-green-500',
+    pending: 'bg-yellow-400',
+    missing: 'bg-red-500',
+    error:   'bg-red-500',
+};
+const STATUS_BADGE_CLASSES = {
+    ok:      'bg-green-100 text-green-700 dark:bg-green-900 dark:text-green-300',
+    pending: 'bg-yellow-100 text-yellow-700 dark:bg-yellow-900 dark:text-yellow-300',
+    missing: 'bg-red-100 text-red-700 dark:bg-red-900 dark:text-red-300',
+    error:   'bg-red-100 text-red-700 dark:bg-red-900 dark:text-red-300',
+};
+const STATUS_BADGE_DEFAULT = 'bg-gray-100 text-gray-600 dark:bg-slate-700 dark:text-gray-400';
+const DOT_COLORS = ['bg-green-500', 'bg-yellow-400', 'bg-red-500', 'bg-gray-400'];
+const BADGE_COLORS = [
+    'bg-green-100', 'text-green-700', 'dark:bg-green-900', 'dark:text-green-300',
+    'bg-yellow-100', 'text-yellow-700', 'dark:bg-yellow-900', 'dark:text-yellow-300',
+    'bg-red-100', 'text-red-700', 'dark:bg-red-900', 'dark:text-red-300',
+    'bg-gray-100', 'text-gray-600', 'dark:bg-slate-700', 'dark:text-gray-400',
+];
+
+function patchAgent(card, agent) {
+    // Status dot
+    const dot = card.querySelector('.status-dot');
+    if (dot) {
+        dot.classList.remove(...DOT_COLORS);
+        dot.classList.add(STATUS_DOT[agent.status] || 'bg-gray-400');
+    }
+
+    // Status badge
+    const badge = card.querySelector('.status-badge');
+    if (badge) {
+        badge.classList.remove(...BADGE_COLORS);
+        const label = agent.status ? agent.status.charAt(0).toUpperCase() + agent.status.slice(1) : 'Unknown';
+        badge.textContent = label === 'Ok' ? 'OK' : label;
+        const cls = STATUS_BADGE_CLASSES[agent.status] || STATUS_BADGE_DEFAULT;
+        badge.classList.add(...cls.split(' '));
+    }
+
+    // Last seen / age
+    const lastSeen = card.querySelector('.last-seen-value');
+    if (lastSeen) {
+        if (agent.last_seen) {
+            const age = agent.age_minutes != null
+                ? ` <span class="text-gray-400 dark:text-gray-500 font-normal">(${agent.age_minutes}m ago)</span>`
+                : '';
+            lastSeen.innerHTML = agent.last_seen + age;
+        } else {
+            lastSeen.textContent = 'Never';
+        }
+    }
+
+    // Update pending indicator
+    const indicator = card.querySelector('.update-pending-indicator');
+    if (indicator) {
+        indicator.classList.toggle('hidden', !agent.update_pending);
+    }
+}
+
+function liveRefresh() {
+    fetch('/api/admin/watchers')
+        .then(r => r.json())
+        .then(agents => {
+            agents.forEach(agent => {
+                const safeId = agent.id.replace(/ /g, '-');
+                const card = document.getElementById('agent-' + safeId);
+                if (card) patchAgent(card, agent);
+            });
+        })
+        .catch(() => {}); // silently ignore fetch errors
+}
+
+setInterval(liveRefresh, 30000);
+</script>
+{% endblock %}

templates/settings.html

@@ -41,6 +41,12 @@
         </svg>
         Danger Zone
     </button>
+    <button class="settings-tab text-gray-400 dark:text-gray-500" data-tab="developer" onclick="showTab('developer')">
+        <svg class="w-4 h-4 inline-block mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 9l3 3-3 3m5 0h3M5 20h14a2 2 0 002-2V6a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z"/>
+        </svg>
+        Developer
+    </button>
 </div>
 
 <!-- General Tab -->
@@ -514,6 +520,32 @@
     </div>
 </div>
 
+<!-- Developer Tab -->
+<div id="developer-tab" class="tab-content hidden">
+    <div class="space-y-6">
+        <div class="bg-white dark:bg-slate-800 rounded-xl shadow-lg p-6">
+            <h2 class="text-xl font-semibold text-gray-900 dark:text-white mb-1">Developer Tools</h2>
+            <p class="text-sm text-gray-500 dark:text-gray-400 mb-6">Admin-only tools for managing field watcher agents and diagnosing connectivity.</p>
+
+            <div class="space-y-4">
+                <!-- Watcher Manager -->
+                <div class="flex items-center justify-between p-4 bg-gray-50 dark:bg-slate-700 rounded-lg">
+                    <div>
+                        <div class="font-medium text-gray-900 dark:text-white">Watcher Manager</div>
+                        <div class="text-sm text-gray-500 dark:text-gray-400 mt-0.5">
+                            Monitor series3-watcher and thor-watcher agents. View status, log tails, and push remote updates.
+                        </div>
+                    </div>
+                    <a href="/admin/watchers"
+                       class="ml-6 px-4 py-2 bg-seismo-orange hover:bg-orange-600 text-white text-sm font-medium rounded-lg transition-colors whitespace-nowrap">
+                        Open
+                    </a>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+
 <style>
 .settings-tab {
     padding: 0.75rem 1.5rem;