backend/main.py

@@ -18,7 +18,7 @@ Base.metadata.create_all(bind=engine)
 ENVIRONMENT = os.getenv("ENVIRONMENT", "production")
 
 # Initialize FastAPI app
-VERSION = "0.2.2"
+VERSION = "0.2.3"
 app = FastAPI(
     title="Seismo Fleet Manager",
     description="Backend API for managing seismograph fleet status",

backend/migrate_add_user_preferences.py

@@ -0,0 +1,80 @@
+"""
+Migration script to add user_preferences table.
+
+This creates a new table for storing persistent user preferences:
+- Display settings (timezone, theme, date format)
+- Auto-refresh configuration
+- Calibration defaults
+- Status threshold customization
+
+Run this script once to migrate an existing database.
+"""
+
+import sqlite3
+import os
+
+# Database path
+DB_PATH = "./data/seismo_fleet.db"
+
+def migrate_database():
+    """Create user_preferences table"""
+
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        print("The database will be created automatically when you run the application.")
+        return
+
+    print(f"Migrating database: {DB_PATH}")
+
+    conn = sqlite3.connect(DB_PATH)
+    cursor = conn.cursor()
+
+    # Check if user_preferences table already exists
+    cursor.execute("SELECT name FROM sqlite_master WHERE type='table' AND name='user_preferences'")
+    table_exists = cursor.fetchone()
+
+    if table_exists:
+        print("Migration already applied - user_preferences table exists")
+        conn.close()
+        return
+
+    print("Creating user_preferences table...")
+
+    try:
+        cursor.execute("""
+            CREATE TABLE user_preferences (
+                id INTEGER PRIMARY KEY DEFAULT 1,
+                timezone TEXT DEFAULT 'America/New_York',
+                theme TEXT DEFAULT 'auto',
+                auto_refresh_interval INTEGER DEFAULT 10,
+                date_format TEXT DEFAULT 'MM/DD/YYYY',
+                table_rows_per_page INTEGER DEFAULT 25,
+                calibration_interval_days INTEGER DEFAULT 365,
+                calibration_warning_days INTEGER DEFAULT 30,
+                status_ok_threshold_hours INTEGER DEFAULT 12,
+                status_pending_threshold_hours INTEGER DEFAULT 24,
+                updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        print("  ✓ Created user_preferences table")
+
+        # Insert default preferences
+        cursor.execute("""
+            INSERT INTO user_preferences (id) VALUES (1)
+        """)
+        print("  ✓ Inserted default preferences")
+
+        conn.commit()
+        print("\nMigration completed successfully!")
+
+    except sqlite3.Error as e:
+        print(f"\nError during migration: {e}")
+        conn.rollback()
+        raise
+
+    finally:
+        conn.close()
+
+
+if __name__ == "__main__":
+    migrate_database()

backend/models.py

@@ -1,4 +1,4 @@
-from sqlalchemy import Column, String, DateTime, Boolean, Text, Date
+from sqlalchemy import Column, String, DateTime, Boolean, Text, Date, Integer
 from datetime import datetime
 from backend.database import Base
 
@@ -56,4 +56,24 @@ class IgnoredUnit(Base):
 
     id = Column(String, primary_key=True, index=True)
     reason = Column(String, nullable=True)
-    ignored_at = Column(DateTime, default=datetime.utcnow)
+    ignored_at = Column(DateTime, default=datetime.utcnow)
+
+
+class UserPreferences(Base):
+    """
+    User preferences: persistent storage for application settings.
+    Single-row table (id=1) to store global user preferences.
+    """
+    __tablename__ = "user_preferences"
+
+    id = Column(Integer, primary_key=True, default=1)
+    timezone = Column(String, default="America/New_York")
+    theme = Column(String, default="auto")  # auto, light, dark
+    auto_refresh_interval = Column(Integer, default=10)  # seconds
+    date_format = Column(String, default="MM/DD/YYYY")
+    table_rows_per_page = Column(Integer, default=25)
+    calibration_interval_days = Column(Integer, default=365)
+    calibration_warning_days = Column(Integer, default=30)
+    status_ok_threshold_hours = Column(Integer, default=12)
+    status_pending_threshold_hours = Column(Integer, default=24)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

backend/routers/settings.py

@@ -2,11 +2,13 @@ from fastapi import APIRouter, Depends, HTTPException, UploadFile, File
 from fastapi.responses import StreamingResponse
 from sqlalchemy.orm import Session
 from datetime import datetime, date
+from pydantic import BaseModel
+from typing import Optional
 import csv
 import io
 
 from backend.database import get_db
-from backend.models import RosterUnit, Emitter, IgnoredUnit
+from backend.models import RosterUnit, Emitter, IgnoredUnit, UserPreferences
 
 router = APIRouter(prefix="/api/settings", tags=["settings"])
 
@@ -239,3 +241,87 @@ def clear_ignored(db: Session = Depends(get_db)):
     except Exception as e:
         db.rollback()
         raise HTTPException(status_code=500, detail=f"Clear failed: {str(e)}")
+
+
+# User Preferences Endpoints
+
+class PreferencesUpdate(BaseModel):
+    """Schema for updating user preferences (all fields optional)"""
+    timezone: Optional[str] = None
+    theme: Optional[str] = None
+    auto_refresh_interval: Optional[int] = None
+    date_format: Optional[str] = None
+    table_rows_per_page: Optional[int] = None
+    calibration_interval_days: Optional[int] = None
+    calibration_warning_days: Optional[int] = None
+    status_ok_threshold_hours: Optional[int] = None
+    status_pending_threshold_hours: Optional[int] = None
+
+
+@router.get("/preferences")
+def get_preferences(db: Session = Depends(get_db)):
+    """
+    Get user preferences. Creates default preferences if none exist.
+    """
+    prefs = db.query(UserPreferences).filter(UserPreferences.id == 1).first()
+
+    if not prefs:
+        # Create default preferences
+        prefs = UserPreferences(id=1)
+        db.add(prefs)
+        db.commit()
+        db.refresh(prefs)
+
+    return {
+        "timezone": prefs.timezone,
+        "theme": prefs.theme,
+        "auto_refresh_interval": prefs.auto_refresh_interval,
+        "date_format": prefs.date_format,
+        "table_rows_per_page": prefs.table_rows_per_page,
+        "calibration_interval_days": prefs.calibration_interval_days,
+        "calibration_warning_days": prefs.calibration_warning_days,
+        "status_ok_threshold_hours": prefs.status_ok_threshold_hours,
+        "status_pending_threshold_hours": prefs.status_pending_threshold_hours,
+        "updated_at": prefs.updated_at.isoformat() if prefs.updated_at else None
+    }
+
+
+@router.put("/preferences")
+def update_preferences(
+    updates: PreferencesUpdate,
+    db: Session = Depends(get_db)
+):
+    """
+    Update user preferences. Accepts partial updates.
+    Creates default preferences if none exist.
+    """
+    prefs = db.query(UserPreferences).filter(UserPreferences.id == 1).first()
+
+    if not prefs:
+        # Create default preferences
+        prefs = UserPreferences(id=1)
+        db.add(prefs)
+
+    # Update only provided fields
+    update_data = updates.dict(exclude_unset=True)
+    for field, value in update_data.items():
+        setattr(prefs, field, value)
+
+    prefs.updated_at = datetime.utcnow()
+
+    db.commit()
+    db.refresh(prefs)
+
+    return {
+        "message": "Preferences updated successfully",
+        "timezone": prefs.timezone,
+        "theme": prefs.theme,
+        "auto_refresh_interval": prefs.auto_refresh_interval,
+        "date_format": prefs.date_format,
+        "table_rows_per_page": prefs.table_rows_per_page,
+        "calibration_interval_days": prefs.calibration_interval_days,
+        "calibration_warning_days": prefs.calibration_warning_days,
+        "status_ok_threshold_hours": prefs.status_ok_threshold_hours,
+        "status_pending_threshold_hours": prefs.status_pending_threshold_hours,
+        "updated_at": prefs.updated_at.isoformat() if prefs.updated_at else None
+    }

templates/base.html

@@ -149,6 +149,116 @@
         } else if (localStorage.getItem('theme') === 'dark') {
             document.documentElement.classList.add('dark');
         }
+
+        // Helper function: Convert timestamp to relative time
+        function timeAgo(dateString) {
+            if (!dateString) return 'Never';
+
+            const date = new Date(dateString);
+            const now = new Date();
+            const seconds = Math.floor((now - date) / 1000);
+
+            if (seconds < 60) return `${seconds}s ago`;
+
+            const minutes = Math.floor(seconds / 60);
+            if (minutes < 60) return `${minutes}m ago`;
+
+            const hours = Math.floor(minutes / 60);
+            if (hours < 24) {
+                const remainingMins = minutes % 60;
+                return remainingMins > 0 ? `${hours}h ${remainingMins}m ago` : `${hours}h ago`;
+            }
+
+            const days = Math.floor(hours / 24);
+            if (days < 7) {
+                const remainingHours = hours % 24;
+                return remainingHours > 0 ? `${days}d ${remainingHours}h ago` : `${days}d ago`;
+            }
+
+            const weeks = Math.floor(days / 7);
+            if (weeks < 4) {
+                const remainingDays = days % 7;
+                return remainingDays > 0 ? `${weeks}w ${remainingDays}d ago` : `${weeks}w ago`;
+            }
+
+            const months = Math.floor(days / 30);
+            return `${months}mo ago`;
+        }
+
+        // Helper function: Get user's selected timezone
+        function getTimezone() {
+            return localStorage.getItem('timezone') || 'America/New_York';
+        }
+
+        // Helper function: Format timestamp with tooltip (timezone-aware)
+        function formatTimestamp(dateString) {
+            if (!dateString) return '<span class="text-gray-400">Never</span>';
+
+            const date = new Date(dateString);
+            const timezone = getTimezone();
+
+            const fullDate = date.toLocaleString('en-US', {
+                weekday: 'short',
+                year: 'numeric',
+                month: 'short',
+                day: 'numeric',
+                hour: '2-digit',
+                minute: '2-digit',
+                second: '2-digit',
+                timeZone: timezone,
+                timeZoneName: 'short'
+            });
+
+            return `<span title="${fullDate}" class="cursor-help">${timeAgo(dateString)}</span>`;
+        }
+
+        // Helper function: Format timestamp as full date/time (no relative time)
+        // Format: "9/10/2020 8:00 AM EST"
+        function formatFullTimestamp(dateString) {
+            if (!dateString) return 'Never';
+
+            const date = new Date(dateString);
+            const timezone = getTimezone();
+
+            return date.toLocaleString('en-US', {
+                month: 'numeric',
+                day: 'numeric',
+                year: 'numeric',
+                hour: 'numeric',
+                minute: '2-digit',
+                timeZone: timezone,
+                timeZoneName: 'short'
+            });
+        }
+
+        // Update all timestamps on page load and periodically
+        function updateAllTimestamps() {
+            document.querySelectorAll('[data-timestamp]').forEach(el => {
+                const timestamp = el.getAttribute('data-timestamp');
+                el.innerHTML = formatTimestamp(timestamp);
+            });
+        }
+
+        // Run on load and every minute
+        updateAllTimestamps();
+        setInterval(updateAllTimestamps, 60000);
+
+        // Copy to clipboard helper
+        function copyToClipboard(text, button) {
+            navigator.clipboard.writeText(text).then(() => {
+                // Visual feedback
+                const originalHTML = button.innerHTML;
+                button.innerHTML = '<svg class="w-3 h-3" fill="currentColor" viewBox="0 0 20 20"><path fill-rule="evenodd" d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z" clip-rule="evenodd"/></svg>';
+                button.classList.add('text-green-500');
+
+                setTimeout(() => {
+                    button.innerHTML = originalHTML;
+                    button.classList.remove('text-green-500');
+                }, 1500);
+            }).catch(err => {
+                console.error('Failed to copy:', err);
+            });
+        }
     </script>
 
     {% block extra_scripts %}{% endblock %}

templates/dashboard.html

@@ -10,9 +10,15 @@
 </div>
 {% endif %}
 
-<div class="mb-8">
-    <h1 class="text-3xl font-bold text-gray-900 dark:text-white">Dashboard</h1>
-    <p class="text-gray-600 dark:text-gray-400 mt-1">Fleet overview and recent activity</p>
+<div class="mb-8 flex justify-between items-center">
+    <div>
+        <h1 class="text-3xl font-bold text-gray-900 dark:text-white">Dashboard</h1>
+        <p class="text-gray-600 dark:text-gray-400 mt-1">Fleet overview and recent activity</p>
+    </div>
+    <div class="text-right">
+        <p class="text-xs text-gray-500 dark:text-gray-400">Last updated</p>
+        <p id="last-refresh" class="text-sm text-gray-700 dark:text-gray-300 font-mono">--</p>
+    </div>
 </div>
 
 <!-- Dashboard cards with auto-refresh -->
@@ -48,23 +54,35 @@
                 </div>
                 <div class="border-t border-gray-200 dark:border-gray-700 pt-3 mt-3">
                     <p class="text-xs text-gray-500 dark:text-gray-500 mb-2 italic">Deployed Status:</p>
-                    <div class="flex justify-between items-center mb-2">
+                    <div class="flex justify-between items-center mb-2" title="Units reporting normally (last seen < 12 hours)">
                         <div class="flex items-center">
-                            <span class="w-3 h-3 rounded-full bg-green-500 mr-2"></span>
+                            <span class="w-3 h-3 rounded-full bg-green-500 mr-2 flex items-center justify-center">
+                                <svg class="w-2 h-2 text-white" fill="currentColor" viewBox="0 0 20 20">
+                                    <path fill-rule="evenodd" d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z" clip-rule="evenodd"/>
+                                </svg>
+                            </span>
                             <span class="text-sm text-gray-600 dark:text-gray-400">OK</span>
                         </div>
                         <span id="status-ok" class="font-semibold text-green-600 dark:text-green-400">--</span>
                     </div>
-                    <div class="flex justify-between items-center mb-2">
+                    <div class="flex justify-between items-center mb-2" title="Units with delayed reports (12-24 hours)">
                         <div class="flex items-center">
-                            <span class="w-3 h-3 rounded-full bg-yellow-500 mr-2"></span>
+                            <span class="w-3 h-3 rounded-full bg-yellow-500 mr-2 flex items-center justify-center">
+                                <svg class="w-2 h-2 text-white" fill="currentColor" viewBox="0 0 20 20">
+                                    <path fill-rule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zm1-12a1 1 0 10-2 0v4a1 1 0 00.293.707l2.828 2.829a1 1 0 101.415-1.415L11 9.586V6z" clip-rule="evenodd"/>
+                                </svg>
+                            </span>
                             <span class="text-sm text-gray-600 dark:text-gray-400">Pending</span>
                         </div>
                         <span id="status-pending" class="font-semibold text-yellow-600 dark:text-yellow-400">--</span>
                     </div>
-                    <div class="flex justify-between items-center">
+                    <div class="flex justify-between items-center" title="Units not reporting (> 24 hours)">
                         <div class="flex items-center">
-                            <span class="w-3 h-3 rounded-full bg-red-500 mr-2"></span>
+                            <span class="w-3 h-3 rounded-full bg-red-500 mr-2 flex items-center justify-center">
+                                <svg class="w-2 h-2 text-white" fill="currentColor" viewBox="0 0 20 20">
+                                    <path fill-rule="evenodd" d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z" clip-rule="evenodd"/>
+                                </svg>
+                            </span>
                             <span class="text-sm text-gray-600 dark:text-gray-400">Missing</span>
                         </div>
                         <span id="status-missing" class="font-semibold text-red-600 dark:text-red-400">--</span>
@@ -185,6 +203,17 @@ function updateDashboard(event) {
     try {
         const data = JSON.parse(event.detail.xhr.response);
 
+        // Update "Last updated" timestamp with timezone
+        const now = new Date();
+        const timezone = localStorage.getItem('timezone') || 'America/New_York';
+        document.getElementById('last-refresh').textContent = now.toLocaleTimeString('en-US', {
+            hour: '2-digit',
+            minute: '2-digit',
+            second: '2-digit',
+            timeZone: timezone,
+            timeZoneName: 'short'
+        });
+
         // ===== Fleet summary numbers =====
         document.getElementById('total-units').textContent = data.summary?.total ?? 0;
         document.getElementById('deployed-units').textContent = data.summary?.active ?? 0;

templates/partials/active_table.html

@@ -46,5 +46,11 @@
     {% endfor %}
 </div>
 {% else %}
-<p class="text-sm text-gray-500 dark:text-gray-400 text-center py-8">No active units</p>
+<div class="text-center py-12">
+    <svg class="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M20 13V6a2 2 0 00-2-2H6a2 2 0 00-2 2v7m16 0v5a2 2 0 01-2 2H6a2 2 0 01-2-2v-5m16 0h-2.586a1 1 0 00-.707.293l-2.414 2.414a1 1 0 01-.707.293h-3.172a1 1 0 01-.707-.293l-2.414-2.414A1 1 0 006.586 13H4"></path>
+    </svg>
+    <h3 class="mt-2 text-sm font-medium text-gray-900 dark:text-gray-100">No active units</h3>
+    <p class="mt-1 text-sm text-gray-500 dark:text-gray-400">Get started by adding a new unit to the fleet.</p>
+</div>
 {% endif %}

templates/partials/benched_table.html

@@ -46,5 +46,11 @@
     {% endfor %}
 </div>
 {% else %}
-<p class="text-sm text-gray-500 dark:text-gray-400 text-center py-8">No benched units</p>
+<div class="text-center py-12">
+    <svg class="mx-auto h-12 w-12 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2"></path>
+    </svg>
+    <h3 class="mt-2 text-sm font-medium text-gray-900 dark:text-gray-100">No benched units</h3>
+    <p class="mt-1 text-sm text-gray-500 dark:text-gray-400">Units awaiting deployment will appear here.</p>
+</div>
 {% endif %}

templates/roster.html

@@ -34,6 +34,21 @@
 <!-- Fleet Roster with Tabs -->
 <div class="rounded-xl shadow-lg bg-white dark:bg-slate-800 p-6">
 
+    <!-- Search Bar -->
+    <div class="mb-4">
+        <div class="relative">
+            <input
+                type="text"
+                id="roster-search"
+                placeholder="Search by Unit ID, Type, or Note..."
+                class="w-full px-4 py-2 pl-10 pr-4 text-gray-900 dark:text-gray-100 bg-gray-100 dark:bg-gray-700 border border-gray-300 dark:border-gray-600 rounded-lg focus:outline-none focus:ring-2 focus:ring-seismo-orange"
+                onkeyup="filterRosterTable()">
+            <svg class="absolute left-3 top-3 w-5 h-5 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"></path>
+            </svg>
+        </div>
+    </div>
+
     <!-- Tab Bar -->
     <div class="flex border-b border-gray-200 dark:border-gray-700 mb-4">
         <button
@@ -805,6 +820,31 @@
             alert(`Error: ${error.message}`);
         }
     }
+
+    // Filter roster table based on search input
+    function filterRosterTable() {
+        const searchInput = document.getElementById('roster-search').value.toLowerCase();
+        const table = document.querySelector('#roster-content table tbody');
+
+        if (!table) return;
+
+        const rows = table.getElementsByTagName('tr');
+
+        for (let row of rows) {
+            const cells = row.getElementsByTagName('td');
+            if (cells.length === 0) continue; // Skip header or empty rows
+
+            const unitId = cells[1]?.textContent?.toLowerCase() || '';
+            const unitType = cells[2]?.textContent?.toLowerCase() || '';
+            const note = cells[6]?.textContent?.toLowerCase() || '';
+
+            const matches = unitId.includes(searchInput) ||
+                          unitType.includes(searchInput) ||
+                          note.includes(searchInput);
+
+            row.style.display = matches ? '' : 'none';
+        }
+    }
 </script>
 
 <style>

templates/unit_detail.html

@@ -4,14 +4,44 @@
 
 {% block content %}
 <div class="mb-6">
-    <a href="/roster" class="text-seismo-orange hover:text-seismo-burgundy inline-flex items-center mb-4">
-        <svg class="w-4 h-4 mr-1" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-            <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7"></path>
-        </svg>
-        Back to Fleet Roster
-    </a>
+    <!-- Breadcrumb Navigation -->
+    <nav class="flex mb-4 text-sm" aria-label="Breadcrumb">
+        <ol class="inline-flex items-center space-x-1 md:space-x-3">
+            <li class="inline-flex items-center">
+                <a href="/" class="text-gray-500 hover:text-seismo-orange dark:text-gray-400">
+                    Dashboard
+                </a>
+            </li>
+            <li>
+                <div class="flex items-center">
+                    <svg class="w-4 h-4 text-gray-400" fill="currentColor" viewBox="0 0 20 20">
+                        <path fill-rule="evenodd" d="M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z" clip-rule="evenodd"></path>
+                    </svg>
+                    <a href="/roster" class="ml-1 text-gray-500 hover:text-seismo-orange dark:text-gray-400">
+                        Fleet Roster
+                    </a>
+                </div>
+            </li>
+            <li aria-current="page">
+                <div class="flex items-center">
+                    <svg class="w-4 h-4 text-gray-400" fill="currentColor" viewBox="0 0 20 20">
+                        <path fill-rule="evenodd" d="M7.293 14.707a1 1 0 010-1.414L10.586 10 7.293 6.707a1 1 0 011.414-1.414l4 4a1 1 0 010 1.414l-4 4a1 1 0 01-1.414 0z" clip-rule="evenodd"></path>
+                    </svg>
+                    <span class="ml-1 text-gray-700 dark:text-gray-300 font-medium" id="breadcrumb-unit">Unit</span>
+                </div>
+            </li>
+        </ol>
+    </nav>
+
     <div class="flex justify-between items-center">
-        <h1 class="text-3xl font-bold text-gray-900 dark:text-white" id="pageTitle">Loading...</h1>
+        <div class="flex items-center gap-2">
+            <h1 class="text-3xl font-bold text-gray-900 dark:text-white" id="pageTitle">Loading...</h1>
+            <button onclick="copyToClipboard(window.currentUnitId, this)" class="text-gray-400 hover:text-gray-600 dark:hover:text-gray-300 transition-colors p-1" title="Copy Unit ID">
+                <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M8 16H6a2 2 0 01-2-2V6a2 2 0 012-2h8a2 2 0 012 2v2m-6 12h8a2 2 0 002-2v-8a2 2 0 00-2-2h-8a2 2 0 00-2 2v8a2 2 0 002 2z"></path>
+                </svg>
+            </button>
+        </div>
         <div class="flex gap-3">
             <button id="editButton" onclick="enterEditMode()" class="px-4 py-2 bg-seismo-orange hover:bg-orange-600 text-white rounded-lg transition-colors flex items-center gap-2">
                 <svg class="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
@@ -323,8 +353,10 @@ async function loadUnitData() {
 
 // Populate view mode (read-only display)
 function populateViewMode() {
-    // Update page title
+    // Update page title and store unit ID for copy function
+    window.currentUnitId = currentUnit.id;
     document.getElementById('pageTitle').textContent = `Unit ${currentUnit.id}`;
+    document.getElementById('breadcrumb-unit').textContent = currentUnit.id;
 
     // Get status info from snapshot
     let unitStatus = null;
@@ -348,7 +380,14 @@ function populateViewMode() {
         document.getElementById('statusIndicator').className = `w-3 h-3 rounded-full ${statusColors[unitStatus.status] || 'bg-gray-400'}`;
         document.getElementById('statusText').className = `font-semibold ${statusTextColors[unitStatus.status] || 'text-gray-600'}`;
         document.getElementById('statusText').textContent = unitStatus.status || 'Unknown';
-        document.getElementById('lastSeen').textContent = unitStatus.last || '--';
+
+        // Format "Last Seen" with timezone-aware formatting
+        if (unitStatus.last && typeof formatFullTimestamp === 'function') {
+            document.getElementById('lastSeen').textContent = formatFullTimestamp(unitStatus.last);
+        } else {
+            document.getElementById('lastSeen').textContent = unitStatus.last || '--';
+        }
+
         document.getElementById('age').textContent = unitStatus.age || '--';
     } else {
         document.getElementById('statusIndicator').className = 'w-3 h-3 rounded-full bg-gray-400';