get_timesheets_list selected `timesheet.sales_invoice | detail.sales_invoice`,
intending COALESCE (pick the parent timesheet's invoice, else the detail's) -- the
original raw SQL was COALESCE(ts.sales_invoice, tsd.sales_invoice). pypika's `|` is a
bitwise OR, not a coalesce:
- Postgres: `varchar | varchar` -> "operator does not exist" (hard error).
- MariaDB: bitwise OR coerces the operands to integers; with a NULL detail invoice the
result is NULL, so the portal showed no invoice even when the timesheet was billed.
Replace with Coalesce(table.sales_invoice, child_table.sales_invoice).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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