Delete row sig_fc2bbb116054 from signals

id sig_fc2bbb116054
event_id evt_6575c87d4308
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T01:16:49.917857+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:90b0eb7043a0ff3c
throttle_s 0
created_at 2026-04-21T01:16:49.917857+00:00
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