Delete row sig_3b278796799f from signals

id sig_3b278796799f
event_id evt_63bf844a1c86
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T07:44:11.378892+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:31b8ef4e6882f24f
throttle_s 0
created_at 2026-04-12T07:44:11.378892+00:00
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