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Maurice
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A plugin's own database runs on the host's event loop, and the only bounds were a regex denylist, the 256 MB quota and a 100,000 row cap. A select whose every row is expensive, or a long scan under the cap, could hold the loop for as long as it liked. query() and tx() now get a wall-clock budget of 2 s, read between the rows a statement yields and between the statements of a batch. Past it the call throws, and a tx rolls back whole like any other failure inside it. The row cap and the budget are overridable per PluginDataDb for tests; the defaults are what production runs. better-sqlite3 has no interrupt or progress handler, so a statement that yields nothing until it is done, such as an aggregate over a cross join, still runs to its first row. Only moving plugin SQL off the host thread can bound that; the SDK README and the plugin wiki state the budget and this limit.