add find quiet background files

Author: nicHoch

.gitignore

@@ -166,3 +166,4 @@ stixcore/data/test/idb/v2.26.38/idb.sqlite
 .python-version
 sunpy/_version.py
 stixcore/_version.py
+.claude/*

stixcore/data/stixcore.ini

@@ -36,3 +36,15 @@ soop_files_download = ./stixcore/data/soop
 ecc_path = /opt/stix_det_cal/bin/
 [Processing]
 flarelist_sdc_min_count = 1000
+# background-data-file lookup (find_background_file_for_time)
+flarelist_bkg_window_past_days = 21
+flarelist_bkg_window_future_days = 21
+flarelist_bkg_min_duration_s = 500
+# require the background file to share the flare's on-board ELUT configuration (ELUTManager lookup)
+flarelist_bkg_require_same_elut = True
+# optional stricter selection (default OFF - all three move common cases, not just edge cases):
+#   purpose preference: prefer purpose=="Background" unless a subject-only match is this many days closer
+#   (0.0 disables); exclude "elevated" backgrounds; drop requests whose comment references a flare id
+flarelist_bkg_purpose_penalty_days = 0.0
+flarelist_bkg_exclude_elevated = False
+flarelist_bkg_exclude_flare_comment = True

stixcore/data/test/publish/rid_lut.csv

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:2ba33aa45a7d045dcbc08d1ddddf8bdf8d01dde93e01fdf4db0c12e1dfb0b4bf
-size 1005
+oid sha256:577485ea766335f15fb1ac4e40f1803d96e82919fd77164c429029a11f7afcac
+size 1383