Delete row sig_2675c78464ca from signals

id sig_2675c78464ca
event_id evt_7a1977fbaf80
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T12:37:59.199554+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c2c7897ed4c71b67
throttle_s 0
created_at 2026-04-16T12:37:59.199554+00:00
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