Delete row sig_841a42a1b5aa from signals

id sig_841a42a1b5aa
event_id evt_c8757b681a9c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T17:52:24.014601+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d764fe3d198e749a
throttle_s 0
created_at 2026-04-10T17:52:24.014601+00:00
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