fix(mint): graceful shutdown of background tasks and db connections#954

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fix-mint-shutdown-hang

Commits on Mar 27, 2026

fix(mint): graceful shutdown of background tasks and db connections
a1denvalu3
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feat(mint): add cleanup method to LightningBackend abstract class
a1denvalu3
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Commits on Apr 9, 2026

fix(mint): clean up background tasks in FakeWallet to prevent CI hangs
a1denvalu3
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