Delete row sig_ec9e8c496b0c from signals

id sig_ec9e8c496b0c
event_id evt_69e182351750
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T11:17:29.652876+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:997d36c84a072dca
throttle_s 0
created_at 2026-04-18T11:17:29.652876+00:00
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