Delete row sig_fb2c856c38b3 from signals

id sig_fb2c856c38b3
event_id evt_2ee3f974f56b
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T09:54:12.757775+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6ef8f214cbc43148
throttle_s 0
created_at 2026-04-14T09:54:12.757775+00:00
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