Delete row sig_ef41614ca3ca from signals

id sig_ef41614ca3ca
event_id evt_e17293532fd5
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5539560 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-07T21:20:15Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-10T21:20:15.103563+00:00
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