Delete row sig_77ed3ec23207 from signals

id sig_77ed3ec23207
event_id evt_bf0d82c71f15
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T14:19:54.737703+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0a3e55f214a36547
throttle_s 0
created_at 2026-04-21T14:19:54.737703+00:00
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