Delete row sig_187a7eca8d78 from signals

id sig_187a7eca8d78
event_id evt_8da0ed3d9299
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T01:23:16.654344+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4295f025dbbc61cc
throttle_s 0
created_at 2026-04-10T01:23:16.654344+00:00
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