Delete row sig_21a1905fcae9 from signals

id sig_21a1905fcae9
event_id evt_42c5677a41e2
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-17T13:51:11.885062+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2ddc27c1fe39b6a8
throttle_s 0
created_at 2026-04-17T13:51:11.885062+00:00
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