Delete row sig_ebf4625f6fc2 from signals

id sig_ebf4625f6fc2
event_id evt_010e8c5889ba
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-13T03:26:20.937664+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:415d7334073ef040
throttle_s 0
created_at 2026-04-13T03:26:20.937664+00:00
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