cli: provide an override for the shell command

setup.py

@@ -13,7 +13,8 @@ setup(name='tshistory_supervision',
           'tshistory'
       ],
       entry_points={'tshistory.subcommands': [
-          'migrate-supervision=tshistory_supervision.cli:migrate_supervision'
+          'migrate-supervision=tshistory_supervision.cli:migrate_supervision',
+          'shell=tshistory_supervision.cli:shell'
       ]},
       classifiers=[
           'Development Status :: 4 - Beta',

tshistory_supervision/cli.py

@@ -3,6 +3,8 @@ import click
 from sqlalchemy import create_engine
 from tshistory.util import find_dburi
 
+from tshistory_supervision.tsio import timeseries
+
 
 @click.command(name='migrate-supervision')
 @click.argument('dburi')
@@ -23,3 +25,13 @@ def migrate_supervision(dburi, skip_schema=False, namespace='tsh'):
             f'alter schema "{namespace}-automatic.snapshot" '
             f'rename to "{namespace}-upstream.snapshot"'
         )
+
+
+@click.command(name='shell')
+@click.argument('db-uri')
+@click.option('--namespace', default='tsh')
+def shell(db_uri, namespace='tsh'):
+    e = create_engine(find_dburi(db_uri))
+
+    tsh = timeseries(namespace)
+    import pdb; pdb.set_trace()