Delete row sig_3b2220bee877 from signals

id sig_3b2220bee877
event_id evt_e43dae0cbba0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T18:29:11.732469+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f0951dec0f9ab6a6
throttle_s 0
created_at 2026-04-20T18:29:11.732469+00:00
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