Buffered insert at capacity fails to insert in Sqlite

[dannyvankooten]

Because of SQLITE_MAX_VARIABLE_NUMBER, which defaults to 999.

[dannyvankooten]

With 10 columns per (pageview) row, this means we can insert 99 rows at most when using SQLite with default settings.

d116f1f changes the buffer capacity to 90 so we stay clear of this limit.

Alternatively we may still use a higher buffer cap for PostgreSQL or MySQL powered Fathom instances, but I feel a 90 row insert is probably a sensible choice for now.