-- Migration 020: Additional constraints discovered from Django audit
-- Business logic constraints that ensure data integrity

-- ==================== SERVICE CONSTRAINTS ====================

-- One service per location per day
-- Prevents duplicate services at the same address on the same date
CREATE UNIQUE INDEX idx_service_unique_per_address_date
    ON services (account_address_id, date);

-- Only one active session per service
-- A service can only have one session that hasn't ended
CREATE UNIQUE INDEX idx_service_session_unique_active
    ON service_sessions (service_id) WHERE "end" IS NULL;

-- ==================== PROJECT CONSTRAINTS ====================

-- Only one active session per project
-- A project can only have one session that hasn't ended
CREATE UNIQUE INDEX idx_project_session_unique_active
    ON project_sessions (project_id) WHERE "end" IS NULL;

-- ==================== NOTIFICATION CONSTRAINTS ====================

-- One delivery attempt per channel per notification
-- Prevents duplicate delivery attempts for the same notification via the same channel
CREATE UNIQUE INDEX idx_notification_delivery_unique_channel
    ON notification_deliveries (notification_id, channel);

-- ==================== TEAM MEMBER CONSTRAINTS ====================

-- One team member assignment per service per profile
-- Prevents duplicate team member assignments
CREATE UNIQUE INDEX idx_service_team_member_unique
    ON service_team_members (service_id, team_profile_id);

-- One team member assignment per project per profile
-- Prevents duplicate team member assignments
CREATE UNIQUE INDEX idx_project_team_member_unique
    ON project_team_members (project_id, team_profile_id);

-- ==================== CONVERSATION CONSTRAINTS ====================

-- Note: conversation_participants already has UNIQUE (conversation_id, participant_type, participant_id)
-- defined in migration 014, so no additional constraint needed here.

-- ==================== INVOICE CONSTRAINTS ====================

-- One revenue association per invoice
CREATE UNIQUE INDEX idx_invoice_revenue_unique
    ON invoice_revenues (invoice_id, revenue_id);

-- One project association per invoice
CREATE UNIQUE INDEX idx_invoice_project_unique
    ON invoice_projects (invoice_id, project_id);

-- ==================== REPORT CONSTRAINTS ====================

-- One service association per report
CREATE UNIQUE INDEX idx_report_service_unique
    ON report_services (report_id, service_id);

-- One project association per report
CREATE UNIQUE INDEX idx_report_project_unique
    ON report_projects (report_id, project_id);

-- ==================== SESSION COMPLETED TASKS CONSTRAINTS ====================

-- One task completion record per session per task completion
CREATE UNIQUE INDEX idx_service_session_completed_task_unique
    ON service_session_completed_tasks (session_id, task_completion_id);

CREATE UNIQUE INDEX idx_project_session_completed_task_unique
    ON project_session_completed_tasks (session_id, task_completion_id);