Delete row sig_28a03111f035 from signals

id sig_28a03111f035
event_id evt_13b48e81a044
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T07:55:15.053222+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:48d73e60e70626a2
throttle_s 0
created_at 2026-04-12T07:55:15.053222+00:00
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