Delete row sig_ec278d623278 from signals

id sig_ec278d623278
event_id evt_df142c9e7d1c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T07:37:54.070060+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:13b33fa30954eb53
throttle_s 0
created_at 2026-04-14T07:37:54.070060+00:00
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