diff --git a/python/lsst/ts/logging_and_reporting/cdb_aux.py b/python/lsst/ts/logging_and_reporting/cdb_aux.py
new file mode 100644
index 0000000..c8232ce
--- /dev/null
+++ b/python/lsst/ts/logging_and_reporting/cdb_aux.py
@@ -0,0 +1,95 @@
+import os
+
+import pandas as pd
+import requests
+
+
+# Use https://usdf-rsp-dev.slac.stanford.edu/consdb/docs
+# to create a table focused on where to find fields in the schema.
+# Helpful to tell what instruments have a field.
+# May lead to "instrument personality"
+# endpoint='https://usdf-rsp-dev.slac.stanford.edu/consdb/schema'
+def field_schema_location_table(
+    schema_endpoint,  # .../consdb/schema
+    exclude_instruments=None,
+):
+    exclude_default = {
+        # "latiss",
+        # "lsstcam",
+        # "lsstcamsim",
+        # "lsstcomcam",
+        # "lsstcomcamsim",
+        "startrackerfast",
+        "startrackernarrow",
+        "startrackerwide",
+    }
+    if exclude_instruments is None:
+        exclude = exclude_default
+    else:
+        exclude = set(exclude_instruments)
+
+    # schemas[instrum][table] => [field_name_1, ...]
+    schemas = dict()
+
+    token = os.environ.get("ACCESS_TOKEN")
+    auth = ("user", token)
+    timeout = (5.05, 20.0)
+    url = schema_endpoint
+    response = requests.get(url, auth=auth, timeout=timeout)
+    response.raise_for_status()
+    instruments = set(response.json())
+
+    # Collect Fields associated with non-excluded Instruments (with
+    # the Table that contains them).
+    available = instruments - exclude
+    for instrument in available:
+        schemas[instrument] = dict()
+        url = f"{schema_endpoint}/{instrument}"
+        response = requests.get(url, auth=auth, timeout=timeout)
+        response.raise_for_status()
+        for table in set(response.json()):
+            url = f"{schema_endpoint}/{instrument}/{table}"
+            response = requests.get(url, auth=auth, timeout=timeout)
+            response.raise_for_status()
+            schemas[instrument][table] = set(response.json().keys())
+    # Now we have
+    # schemas[instrum][table] => [field_name_1, ...]
+
+    df = pd.DataFrame(
+        [
+            {"instrument": instrum, "table": table, "field": field}
+            for instrum in schemas
+            for table in schemas[instrum]
+            for field in schemas[instrum][table]
+        ]
+    )
+
+    # Its nice to pivot the table for viewing with something like:
+    #   pv = df.pivot_table(index='field',
+    #                       columns='instrument',
+    #                       values='table',
+    #                       aggfunc=lambda x: ' '.join(x))
+    #   HTML(pv.to_html())
+
+    pv = df.pivot_table(
+        index="field", columns="instrument", values="table", aggfunc=list
+    )
+
+    return pv
+
+
+def common_fields(df):
+    """List of fields common to all instruments."""
+    return df[~(df.isna().any(axis=1))].index.to_list()
+
+
+def uncommon_fields(df):
+    """List of fields that are missing from at least one instrument."""
+    return df[df.isna().any(axis=1)].index.to_list()
+
+
+def divergent_personalities(df):
+    """Percent of fields in each instrument that is not common to
+    all instruments.
+    """
+    return (df.isna().sum() / df.shape[0]).to_dict()