Delete row sig_ee47ccffb036 from signals

id sig_ee47ccffb036
event_id evt_bbb853e034e0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T17:58:12.519855+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ebb21ca72a6acfe5
throttle_s 0
created_at 2026-04-21T17:58:12.519855+00:00
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