Modern IDB: SQLite backend
The Modern IDB backing store interface is *very close* to the WK2 Legacy IDB backing store interface, so this task might be a mechanical moving of the WK2 backing store to WebCore.
Some complications will certainly arise.
The remaining blocking bug - SQLite backend needs to support simultaneous transactions - Should not be considered blocking.
Legacy IDB already didn't support simultaneous transactions, so we're currently at parity.
Improving the state of things - especially when it might be difficult - should not be a blocking task.