Delete row sig_b52be35c1f96 from signals

id sig_b52be35c1f96
event_id evt_6e8e3c504f97
watcher_id NULL
signal_type technical_indicator_signal
value {"bars":508,"confidence":0.8426923 ...
threshold NULL
direction NULL
severity high
window NULL
source technical_analyzer
reason_trace {"cutoff_iso":"2026-04-13T20:32:16Z ...
dedupe_key ta:technical_indicator_signal:bigMoveUp:big_move:S ...
throttle_s 0
created_at 2026-04-16T20:32:16.842106+00:00
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