How the Booking Diary Time Slots Work

Source: event_times_controller.rb, event_time.rb

Start times are timezone-corrected based on the company's configured timezone
Mechanic schedule is validated on both create and update to ensure the time falls within working hours
Double-booking is intentionally DISABLED — mechanics CAN be booked on overlapping time slots; the system does not prevent this
Changing a booking's date shifts all associated event_times by the day difference (e.g., moving from Monday to Wednesday shifts all times forward by 2 days)
The "next available time" search checks from today+1 through today+31, looking for a gap for either a specific mechanic or any mechanic
Month view calculates capacity as a percentage using quarter-rounding: 0%, 25%, 50%, 75%, or 100% — there are no intermediate values
Split event times maintain ordering; moving a non-split time entry updates the parent event's date to match
Unscheduled event times (those without a start time) are sorted using the shop's configured open time as a fallback
End time is automatically calculated as start time plus estimated hours

"A mechanic has two bookings at the same time" → This is expected behavior. The system intentionally allows double-booking of mechanics. The diary will show overlapping slots.
"I changed the booking date but the diary times didn't move" → All event_times should shift automatically when the date changes. If they did not, check if the times are split entries, as those have separate handling.
"The next available slot search isn't finding anything" → The search only looks 31 days ahead. If no availability exists within that window (e.g., mechanic fully booked or on leave), it returns nothing.
"The month view shows 50% but the mechanic is more like 60% booked" → Month view uses quarter-rounding (0/25/50/75/100%), so 60% rounds down to 50%.