Delete row sig_219beeeb8948 from signals

id sig_219beeeb8948
event_id evt_456e5249a788
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5685240 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-15T02:14:50Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-18T02:14:50.221457+00:00
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