Delete row sig_c2fd616e4f77 from signals

id sig_c2fd616e4f77
event_id evt_d86f3c44d184
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T09:37:03.187445+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:40981fe597b5a8cb
throttle_s 0
created_at 2026-04-20T09:37:03.187445+00:00
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