Delete row sig_8554c7c9c6e5 from signals

id sig_8554c7c9c6e5
event_id evt_8233d2c2505f
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":600,"confidence":0.5208486 ...
threshold NULL
direction NULL
severity medium
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-15T00:09:29Z ...
dedupe_key ta:technical_indicator_signal:priceBelowEma12:ema_ ...
throttle_s 0
created_at 2026-04-18T00:09:29.980154+00:00
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