feat: show garbage collector in SHOW TRANSACTIONS

[imilinovic]

Release note

SHOW TRANSACTIONS now reports an in-progress storage garbage collection as a synthetic gc row (mirroring the existing snapshot row). Its metadata carries trigger (periodic/forced), phase (unlink/index_cleanup/delete), exclusive_lock, and db_name, so a slow, stuck, or blocking garbage collection is directly observable from a query.

Related product PRs

PRs from product repo this doc page is related to:
memgraph/memgraph#4229

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Project	Deployment	Actions	Updated (UTC)
documentation	Ready	Preview, Comment	Jun 3, 2026 1:31pm