feat: experimental Cosmos DB MongoDB vCore support#605

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Sleepful wants to merge 20 commits intomainfrom

Commits on Apr 8, 2026

fix: decode URL-encoded credentials in MongoDB connection config
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test: add red tests for Cosmos DB mode

rkistner
authored and
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feat: implement Cosmos DB workarounds (wallTime, sentinel, stream guards)
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fix: sentinel checkpoint resolution and setName guard for Cosmos DB
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refactor: rename forceCosmosDb to mode on createCheckpoint
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fix: consistent wall-clock LSNs in cosmosDbMode
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refactor: remove cosmosDbMode test flag, simplify Cosmos DB detection
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fix: detect Cosmos DB on restart, not just initial sync
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fix: skip .lte() dedup check on Cosmos DB to prevent data loss
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fix: write checkpoint polling and resume test reliability on Cosmos DB
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refactor: simplify createWriteCheckpoint Cosmos DB HEAD capture
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fix: startAtOperationTime not set when resumeAfter is null
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fix: increase Cosmos DB test timeouts to eliminate flakes
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Commits on Apr 14, 2026

Commits on Apr 15, 2026

fix: correct misleading comment in getSnapshotLsn()
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