Delete row sig_a3af192787c3 from signals

id sig_a3af192787c3
event_id evt_4739a3544687
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T01:17:35.467284+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6396bfe10282357c
throttle_s 0
created_at 2026-04-19T01:17:35.467284+00:00
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