Delete row sig_5186217fb7fd from signals

id sig_5186217fb7fd
event_id evt_99cd85e0d603
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":179,"confidence":0.5425814 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-13T20:01:59Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-16T20:01:59.882586+00:00
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