feat: execution failure reports, auto-printer for WMT, UTC timezone fix for all timestamps

app/models/__init__.py

@@ -26,7 +26,7 @@ __all__ = [
     'Base', 'Device', 'MessageTemplate', 'LogEntry', 'FileUpload',
     'AnsibleExecution', 'SystemStats', 'InventoryGroup', 'PlaybookExecution',
     'PlaybookHostResult', 'ExecutionQueue', 'device_inventory_association',
-    'WMTGlobalConfig', 'WMTUpdateRequest',
+    'WMTGlobalConfig', 'WMTUpdateRequest', 'ExecutionFailureReport',
 ]
 
 class Device(Base):
@@ -626,4 +626,48 @@ class WMTUpdateRequest(Base):
         }
 
     def __repr__(self):
-        return f"<WMTUpdateRequest(mac='{self.mac_address}', status='{self.status}')>"
+        return f"<WMTUpdateRequest(mac='{self.mac_address}', status='{self.status}')>"
+
+
+class ExecutionFailureReport(Base):
+    """Saved report of failed/unreachable hosts from a playbook execution."""
+    __tablename__ = 'execution_failure_reports'
+
+    id = Column(Integer, primary_key=True)
+    execution_id = Column(String(36), nullable=False, index=True)
+    playbook_name = Column(String(255), nullable=False)
+    saved_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+
+    # Counts
+    failed_count = Column(Integer, default=0)
+    unreachable_count = Column(Integer, default=0)
+
+    # JSON list of {hostname, status, reason} objects
+    failed_hosts = Column(Text, nullable=False, default='[]')
+
+    # Optional note added by user when saving
+    note = Column(Text)
+
+    @property
+    def hosts_list(self):
+        try:
+            return json.loads(self.failed_hosts)
+        except Exception:
+            return []
+
+    def to_dict(self):
+        return {
+            'id': self.id,
+            'execution_id': self.execution_id,
+            'playbook_name': self.playbook_name,
+            'saved_at': self.saved_at.isoformat() if self.saved_at else None,
+            'failed_count': self.failed_count,
+            'unreachable_count': self.unreachable_count,
+            'failed_hosts': self.hosts_list,
+            'note': self.note,
+        }
+
+    def __repr__(self):
+        return (f"<ExecutionFailureReport(execution_id='{self.execution_id}', "
+                f"playbook='{self.playbook_name}', failed={self.failed_count}, "
+                f"unreachable={self.unreachable_count})>")