Delete row sig_e7939a44e6da from signals

id sig_e7939a44e6da
event_id evt_dabc86cfdd1b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T14:35:39.061533+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bd414752df978045
throttle_s 0
created_at 2026-04-20T14:35:39.061533+00:00
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