Delete row sig_c1983473317d from signals

id sig_c1983473317d
event_id evt_315f12e4316a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T00:30:05.951009+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f40ac58292cfbb4d
throttle_s 0
created_at 2026-04-10T00:30:05.951009+00:00
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