Delete row sig_414ab8c0f01c from signals

id sig_414ab8c0f01c
event_id evt_5e5104135262
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T08:41:24.469901+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:69f6a17beddc9ba5
throttle_s 0
created_at 2026-04-08T08:41:24.469901+00:00
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