Delete row sig_8773ee9978e0 from signals

id sig_8773ee9978e0
event_id evt_162651f746b9
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T04:02:13.036618+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4827a3583e3228d8
throttle_s 0
created_at 2026-04-12T04:02:13.036618+00:00
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