Delete row sig_f6918eeed026 from signals

id sig_f6918eeed026
event_id evt_fb8e4562b310
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T01:34:03.596275+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d33ba4f76aeba16f
throttle_s 0
created_at 2026-04-20T01:34:03.596275+00:00
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