Delete row sig_3f43fed6d216 from signals

id sig_3f43fed6d216
event_id evt_b9e18695704c
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.4991381 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-18T20:03:00Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-21T20:03:00.836676+00:00
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