Delete row sig_c7ad7f780aae from signals

id sig_c7ad7f780aae
event_id evt_5199fefc4c44
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T10:53:40.642857+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f1e58a4fa5483afa
throttle_s 0
created_at 2026-04-20T10:53:40.642857+00:00
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