Emergency Models

EmergencyEvent

Records that an assigned field team is unavailable for a scheduled survey or installation.

Field	Type	Constraints	Description
id	UUIDField	PK, default=uuid4	Primary key
event_type	CharField(20)	choices: survey, installation	What type of job was affected
survey	ForeignKey(Survey)	nullable, on_delete=CASCADE	If a survey emergency
installation	ForeignKey(Installation)	nullable, on_delete=CASCADE	If an installation emergency
original_team	ForeignKey(Team)	not null, on_delete=PROTECT	Team that reported unavailability
reason	TextField	not null	Why the team is unavailable
reported_by	ForeignKey(User)	not null, on_delete=PROTECT	Who reported the emergency
status	CharField(20)	choices: reported, searching_backup, backup_found, reassigned, rescheduled	Event resolution state
created_at	DateTimeField	auto_now_add	When reported
resolved_at	DateTimeField	nullable	When resolved

Constraint: Exactly one of survey or installation must be non-null (enforced via CheckConstraint).

Indexes: status, event_type, created_at

BackupSearch

Log of each team checked during the backup team search process.

Field	Type	Constraints	Description
id	UUIDField	PK, default=uuid4	Primary key
emergency	ForeignKey(EmergencyEvent)	not null, on_delete=CASCADE	Parent emergency event
searched_team	ForeignKey(Team)	not null, on_delete=PROTECT	Team that was checked
is_available	BooleanField	not null	Whether the team was available
searched_at	DateTimeField	auto_now_add	When the check was performed
searched_by	ForeignKey(User)	not null, on_delete=PROTECT	Central Ops who performed the search

EmergencyAssignment

Records the reassignment to a backup team when one is found.

Field	Type	Constraints	Description
id	UUIDField	PK, default=uuid4	Primary key
emergency	OneToOneField(EmergencyEvent)	not null, on_delete=CASCADE	Parent emergency event
backup_team	ForeignKey(Team)	not null, on_delete=PROTECT	Team taking over
assigned_by	ForeignKey(User)	not null, on_delete=PROTECT	Central Ops who made the assignment
assigned_at	DateTimeField	auto_now_add	Assignment timestamp
outcome	CharField(20)	choices: completed, failed, cancelled	Final outcome of backup assignment

PriorityReschedule

Records a rescheduled appointment when no backup team is available.

Field	Type	Constraints	Description
id	UUIDField	PK, default=uuid4	Primary key
emergency	OneToOneField(EmergencyEvent)	not null, on_delete=CASCADE	Parent emergency event
new_date	DateField	not null	Proposed new date
new_time_slot	CharField(20)	choices: morning, afternoon, evening	Proposed new time slot
customer_confirmed	BooleanField	default=False	Customer agreed to new date
rescheduled_by	ForeignKey(User)	not null, on_delete=PROTECT	Central Ops who rescheduled
created_at	DateTimeField	auto_now_add	When reschedule was created