Delete row sig_b1123f6b56c6 from signals

id sig_b1123f6b56c6
event_id evt_a2e41d500f3c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T12:16:44.900963+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ed3c15e70e83964d
throttle_s 0
created_at 2026-04-16T12:16:44.900963+00:00
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