feat(pool): QuestDBClient sender connection pool (Java parity)#76

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feat/sender-pool

Commits on Jun 30, 2026

fix: Close() disposes borrowed (in-use) senders, racing the borrower's flush on a non-thread-safe inner sender
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fix: Uppercase WS::/WSS:: builds a query pool whose connection string is rejected case-sensitively at query time
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fix: A retired SF slot can permanently shrink pool capacity when the engine defers its lock release past the 5 s teardown budget
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fix: BorrowAsync allocates a linked CancellationTokenSource on every call, even uncontended
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fix: Test coverage gaps: No SF-mode concurrency stress — both multi-threaded tests run on HTTP pools, so AllocateSlotIndex/RetireSlotIndex/SettleLeakDebtLocked (the most race-prone code) are never …
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remove risk of using of sender after return via Borrowed sender
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avoid GC on rescaling decimals that fit BCL decimal range
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add connection timeout property. Change to zero GC BCL decimal rescaling
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Commits on Jul 2, 2026

Commits on Jul 3, 2026

fix sender reaper vs borrow race
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