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# Database for experiment
dbexp = client["calib-cxif5315"]

# Collections:
col1 = dbexp["cspad-0-cxids2-0"]
col2 = dbexp["cspad2x2-0-cxids2-0"]
col3 = dbexp["andor-0-cxids2-0"]

# Document content for dbexp
doc = {
   "_id":ObjectId("53402597d852426020000002"),
   "experiment": "cxif5315"
   "run": 123
   "detector": "cspad-0-cxids2-0"
   "ctype": "pedestals"
   "time_sec": 1516321053
   "time_nsec": 123456789
   "time_stamp": "2018-01-18T16:17:33.123456789-0800"
   "version": "v00-11-22"
   "facility": "LCLS2"
   "uid": "login-name"
   "host": "psanaphi102"
   "comments": ["very good constants", "throw them in trash immediately!"]
   "data_size": 32*185*388
   "data_shape": (32,185,388)
   "data_type": "int16"
   "data": np.array(...)
}

# References or DBRefs for detectors

dbdet = client['calib-cspad'] 
col1 = dbdet['cspad-0-cxids1-0']
col2 = dbdet['cspad-0-cxids2-0']
col3 = dbdet['cspad-0-cxidsd-0']
col4 = dbdet['cspad-0-xcsendstation-0']
col5 = dbdet['cspad-0-xppgon-0']
col6 = dbdet['cspad-0-sxrbeamline-1']
col7 = dbdet['cspad-0-mectargetchamber-0']

# Document content for dbdet
doc = {
   "_id":ObjectId("..."),
   "ref_id": ObjectId("534009e4d852427820000002"),
   etc...
}

ida = fs.put(nda.tobytes())