Calculate business days between two dates, excluding weekends and holidays. This is the core function used for fine calculation.

Holiday and schedule changeset for creating and updating entries.

Schedule Types:

• "holiday" - Specific date holidays (uses holiday_date field)
• "schedule" - Weekly recurring schedule (uses day_of_week field)

Holiday Types (for schedule_type: "holiday"):

• "public" - Public holidays (national/local government holidays)
• "library" - Library-specific holidays (closure days, maintenance days)
• "custom" - Custom holidays defined by the library

Holiday Types (for schedule_type: "schedule"):

• "non_business" - Regular non-business days (e.g., weekends)
• "business" - Regular business days (for reference/override)

Get business days for the current week. Returns list of day numbers that are business days.

Get all active holidays within a date range.

Get non-business days for the current week. Returns list of day numbers that are non-business days.

Get the current weekly schedule configuration. Returns a map with day names as keys and business status as values.

Check if weekly schedule has been configured.

Checks if a date is a custom holiday from the database. @deprecated Use is_specific_holiday?/1 instead

Checks if a given date is a holiday or non-business day. This includes both specific holidays and weekly schedule non-business days. Considers both unit-specific and system-wide rules. Uses ETS caching to avoid repeated database queries.

Checks if a date is a non-business day according to the weekly schedule. This replaces the old hardcoded weekend check. Checks both unit-specific and system-wide schedules. Uses caching to avoid repeated queries for the same day of week.

Checks if a date is a specific holiday from the database. Checks both unit-specific and system-wide holidays. Uses caching to avoid repeated queries for the same date.

Legacy function - checks if a date is a weekend (Saturday or Sunday). Now uses the weekly schedule system, but falls back to hardcoded if no schedule exists.

Set up default weekly schedule (Monday-Friday business, Saturday-Sunday non-business).

Update a specific day's business status in the weekly schedule.