Delete row sig_221b4249841b from signals

id sig_221b4249841b
event_id evt_91d1865e3975
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-07T04:16:18.800675+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4ed56579916208f6
throttle_s 0
created_at 2026-04-07T04:16:18.800675+00:00
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