Delete row sig_09c93505a1bc from signals

id sig_09c93505a1bc
event_id evt_c29fb07d2d01
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T14:04:21.012357+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:558c85ce7d81384b
throttle_s 0
created_at 2026-04-20T14:04:21.012357+00:00
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