-- Migration: 100_worker_timezone.sql
-- Description: Add timezone column to worker_registry for working hours support
-- Created: 2024-12-13

-- Add timezone column to worker_registry
-- Populated from preflight IP geolocation (e.g., 'America/New_York')
ALTER TABLE worker_registry
ADD COLUMN IF NOT EXISTS timezone VARCHAR(50);

-- Add working_hours_id to link worker to a specific working hours profile
-- NULL means use default 'natural_traffic' profile
ALTER TABLE worker_registry
ADD COLUMN IF NOT EXISTS working_hours_id INTEGER REFERENCES working_hours(id);

-- Index for workers by timezone (useful for capacity planning)
CREATE INDEX IF NOT EXISTS idx_worker_registry_timezone ON worker_registry(timezone);

COMMENT ON COLUMN worker_registry.timezone IS 'IANA timezone from preflight IP geolocation (e.g., America/New_York)';
COMMENT ON COLUMN worker_registry.working_hours_id IS 'Reference to working_hours profile. NULL uses default natural_traffic.';