It is not uncommon for an index to be defined as e.g. 'fulltext'
which SQLite3 does not support without a module to create a
virtual table (rather than an index on an existing one). The code
already in place sees that definitions be updated to 'index' on
the fly during creation and later inspection (indexList) - which
causes issue when comparing existing table definitions to what
SilverStripe expects by DataObject configuration. This discrepency
leads to tables constantly being marked to update, although
effectively nothing actually changes. We can save these CPU cycles
and a bit of head scratching by converting to a supported index type.
Code in the field alteration logic had a queries defiend as strings to
begin and commit transactions involve with changing table or column names.
This was causing fatal errors as BEGIN is not a valid keyword within
a trasaction (see SQLite documentation excerpt below).
A new api has been introduced to deal with transactions programmatically,
and this module was updated to support this a few months ago. This is a
tidy up of some missed portions - consuming this API which correctly uses
SAVEPOINT when a nested transaction is required automatically.
https://www.sqlite.org/lang_transaction.html
Transactions created using BEGIN...COMMIT do not nest. For nested
transactions, use the SAVEPOINT and RELEASE commands.
