Delete row sig_85ca47be6a91 from signals

id sig_85ca47be6a91
event_id evt_f509aeb7c4c4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T06:20:47.989088+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1475dfa4caef71b7
throttle_s 0
created_at 2026-04-18T06:20:47.989088+00:00
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