fix(postgres): lock missing items that TransactWriteItems checks or deletes - #387

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yesyayen wants to merge 14 commits into

ExtendDB:mainfrom

yesyayen:fix/twi-absent-key-skew

Commits on Oct 5, 2026

fix(postgres): cancel deadlocked write transactions instead of failing them
yesyayen
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73686b8
fix(postgres): stop a write transaction once its validation answer is known
yesyayen
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e6edd27
test: cap the 5xx a contended transaction run may return
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1d47fd6
docs: describe write transaction contention and lock order
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f708177
test: pin that an invalid first op answers without waiting on later locks
yesyayen
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18447cb
style: backtick the SQLSTATE names in the conflict classifier doc
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0e242c5
test: race write transactions that read missing items
yesyayen
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9ae0a7b
fix(postgres): hold the key of a missing item a write transaction reads
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c69a6f0
docs: describe how write transactions isolate missing items
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242c2e4
fix(postgres): fail a write transaction whose reserved key was not deleted
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a007cca
test: cover a range table and a Delete that loses its key reservation
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9bc3300
docs: say which writers wait for a reserved key
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095bfb5
docs: say that a rollback also releases a reserved key
yesyayen
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92f6b02
test: expect the missing-item races to fail on MongoDB for now
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2b50b4f