Delete row sig_7f3a503fede6 from signals

id sig_7f3a503fede6
event_id evt_e93e710e4d9d
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":55,"confidence":0.54200740 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-06T00:15:28Z ...
dedupe_key ta:technical_indicator_signal:emaCrossDown:ema_sig ...
throttle_s 0
created_at 2026-04-09T00:15:28.519558+00:00
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