[robfrank]

Documents user-visible changes merged in ArcadeData/arcadedb for 26.12.1.

Upgrade notes (how-to/operations/upgrade.adoc, three new 26.12.1 breaking-change entries)

• Java remote client: a non-JSON error page from a proxy is mapped on its HTTP status; a 503 page is a RemoteIntermediaryRefusalException and is no longer resent for non-replayable writes, streamed and time-series writes, or commit (An error answer whose body is not JSON (a proxy's 503, 502 or 504 page) is thrown as a bare JSONException with the status lost, is not retried, and the log says it is retrying arcadedb#11387, PR fix(#11387): an error answer whose body is not JSON is mapped on its status code arcadedb#11536).
• Cypher PROFILE of a write with no RETURN returns no rows (Several Bolt result and streaming responses deviate from the protocol: PROFILE of a RETURN-less write streams rows, a zero-row result announces no column names, and DISCARD omits type and t_last and misclassifies a drain failure arcadedb#11386, PR fix(#11386): PROFILE of a RETURN-less write answers no rows; a zero-row Bolt result announces its RETURN columns arcadedb#11544).
• Bolt announces the column names of a zero-row result (same PR); RETURN * / CALL ... YIELD gap tracked in Bolt: a zero-row RETURN * or CALL ... YIELD still announces no column names (follow-up of #11386) arcadedb#11543.

Java API (Remote) (reference/java-api/java-api-remote.adoc): paragraph under exception types on the non-JSON error page and the retry rules.

HA (how-to/operations/ha.adoc)

• Quarantines (unavailable unique index, emptied dictionary) are now also checked after a schema reload, on a reopen while Raft runs, and on an installed snapshot (HA: unavailable unique index and empty dictionary quarantine only checked at Raft startup, not after a later schema reload arcadedb#11518, PR fix(#11518): recheck the unique-index and dictionary quarantine after a reopen, a schema reload and a snapshot install arcadedb#11528). The known limit "not rechecked after a later schema reload" is removed.
• .raft/applied-index writes a restart depends on are fsynced (HA: .raft/applied-index (and the quarantine it carries) is written without fsync, 0 bytes after a power loss arcadedb#11517, PR fix(#11517): fsync the applied-index writes that carry or clear a quarantine arcadedb#11530).

docs-validator.py passes.

Added 2026-11-12

• RemoteDatabase.commit() resets created records' identity even when the commit may have landed arcadedb#11541 (PR fix(#11541): a remote commit keeps the created records' RIDs unless its failure proves nothing was applied arcadedb#11560): a failed remote commit() keeps the created records' RIDs unless the failure proves nothing was applied. New paragraph in java-api-remote.adoc, new upgrade entry in upgrade.adoc.
• Bolt: a zero-row RETURN * or CALL ... YIELD still announces no column names (follow-up of #11386) arcadedb#11543 (PR fix(#11543): a zero-row RETURN * or standalone CALL announces its columns over Bolt arcadedb#11559): the Bolt zero-row upgrade entry now says RETURN * and standalone CALL ... YIELD announce their columns; the remaining gap is Bolt: a zero-row CALL { ... RETURN * } or YIELD * of a procedure with unknown outputs still announces no columns arcadedb#11571.

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