diff --git a/.gitignore b/.gitignore
index 8b9f408..b2c6123 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1 @@
-*~
-*.pyc
-dist/
 rattail_tempmon.egg-info/
diff --git a/CHANGELOG.md b/CHANGELOG.md
deleted file mode 100644
index a249452..0000000
--- a/CHANGELOG.md
+++ /dev/null
@@ -1,53 +0,0 @@
-
-# Changelog
-All notable changes to rattail-tempmon will be documented in this file.
-
-The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
-and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
-
-## v0.4.6 (2024-08-19)
-
-### Fix
-
-- avoid deprecated base class for config extension
-
-## v0.4.5 (2024-07-02)
-
-### Fix
-
-- fix signature for calls to `get_engines()`
-
-## v0.4.4 (2024-07-02)
-
-### Fix
-
-- avoid deprecated function for engine config
-
-## v0.4.3 (2024-07-01)
-
-### Fix
-
-- remove references, dependency for `six` package
-
-## v0.4.2 (2024-07-01)
-
-### Fix
-
-- remove legacy command definitions
-
-## v0.4.1 (2024-06-14)
-
-### Fix
-
-- fallback to `importlib_metadata` on older python
-
-## v0.4.0 (2024-06-10)
-
-### Feat
-
-- switch from setup.cfg to pyproject.toml + hatchling
-
-
-## Older Releases
-
-Please see `docs/OLDCHANGES.rst` for older release notes.
diff --git a/docs/OLDCHANGES.rst b/CHANGES.rst
similarity index 66%
rename from docs/OLDCHANGES.rst
rename to CHANGES.rst
index 8727078..99b430e 100644
--- a/docs/OLDCHANGES.rst
+++ b/CHANGES.rst
@@ -2,90 +2,6 @@
 CHANGELOG
 =========
 
-NB. this file contains "old" release notes only.  for newer releases
-see the `CHANGELOG.md` file in the source root folder.
-
-
-0.3.0 (2024-05-30)
-------------------
-
-* Migrate all commands to use ``typer``.
-
-
-0.2.10 (2023-11-30)
--------------------
-
-* Update subcommand entry point group names, per wuttjamaican.
-
-
-0.2.9 (2023-05-16)
-------------------
-
-* Replace ``setup.py`` contents with ``setup.cfg``.
-
-
-0.2.8 (2023-02-12)
-------------------
-
-* Refactor ``Query.get()`` => ``Session.get()`` per SQLAlchemy 1.4.
-
-
-0.2.7 (2023-02-10)
-------------------
-
-* Officially drop support for python2.
-
-* Address a warning from SQLAlchemy for ``declarative_base``.
-
-
-0.2.6 (2022-08-06)
-------------------
-
-* Register email profiles provided by this pkg.
-
-
-0.2.5 (2020-09-22)
-------------------
-
-* Remove config for deprecated 'tempmon_critical_temp' email.
-
-* Declare sort order for ``Appliance.probes`` relationship.
-
-
-0.2.4 (2019-04-23)
-------------------
-
-* Make sure we use zero as fallback/default timeout values.
-
-
-0.2.3 (2019-01-28)
-------------------
-
-* Add more template context for email previews.
-
-* Convert ``enabled`` for Client, Probe to use datetime instead of boolean.
-
-* Modify tempmon server logic to take "unfair" time windows into account.
-
-
-0.2.2 (2018-10-25)
-------------------
-
-* Fix bug when sending certain emails while checking probe readings.
-
-
-0.2.1 (2018-10-24)
-------------------
-
-* Make dummy probe use tighter pattern for random readings.
-
-* Add "default" probe timeout logic for server readings check.
-
-* Don't mark client as online unless it's also enabled.
-
-* Add try/catch for client's "read temp" logic.
-
-
 0.2.0 (2018-10-19)
 ------------------
 
diff --git a/README.md b/README.rst
similarity index 64%
rename from README.md
rename to README.rst
index 979c915..39651c1 100644
--- a/README.md
+++ b/README.rst
@@ -1,5 +1,6 @@
 
-# rattail-tempmon
+rattail-tempmon
+===============
 
 Rattail is a retail software framework, released under the GNU General Public
 License.
@@ -7,5 +8,6 @@ License.
 This is the ``rattail-tempmon`` package, which provides a database schema, and
 client/server daemons for recording and processing temperature data.
 
-Please see Rattail's [home page](https://rattailproject.org/) for more
-information.
+Please see Rattail's `home page`_ for more information.
+
+.. _home page: https://rattailproject.org/
diff --git a/pyproject.toml b/pyproject.toml
deleted file mode 100644
index 0e694fa..0000000
--- a/pyproject.toml
+++ /dev/null
@@ -1,52 +0,0 @@
-
-[build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
-
-
-[project]
-name = "rattail-tempmon"
-version = "0.4.6"
-description = "Retail Software Framework - Temperature monitoring add-on"
-readme = "README.md"
-authors = [{name = "Lance Edgar", email = "lance@edbob.org"}]
-license = {text = "GNU GPL v3+"}
-classifiers = [
-        "Development Status :: 3 - Alpha",
-        "Intended Audience :: Developers",
-        "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)",
-        "Natural Language :: English",
-        "Operating System :: OS Independent",
-        "Programming Language :: Python",
-        "Programming Language :: Python :: 3",
-        "Topic :: Office/Business",
-        "Topic :: Software Development :: Libraries :: Python Modules",
-]
-dependencies = [
-        "rattail[db]",
-        "sqlsoup",
-]
-
-
-[project.urls]
-Homepage = "https://rattailproject.org"
-Repository = "https://forgejo.wuttaproject.org/rattail/rattail-tempmon"
-Changelog = "https://forgejo.wuttaproject.org/rattail/rattail-tempmon/src/branch/master/CHANGELOG.md"
-
-
-[project.entry-points."rattail.config.extensions"]
-tempmon = "rattail_tempmon.config:TempmonConfigExtension"
-
-
-[project.entry-points."rattail.typer_imports"]
-rattail_tempmon = "rattail_tempmon.commands"
-
-
-[project.entry-points."rattail.emails"]
-rattail_tempmon = "rattail_tempmon.emails"
-
-
-[tool.commitizen]
-version_provider = "pep621"
-tag_format = "v$version"
-update_changelog_on_bump = true
diff --git a/rattail_tempmon/_version.py b/rattail_tempmon/_version.py
index 7135faa..08b390b 100644
--- a/rattail_tempmon/_version.py
+++ b/rattail_tempmon/_version.py
@@ -1,9 +1,3 @@
 # -*- coding: utf-8; -*-
 
-try:
-    from importlib.metadata import version
-except ImportError:
-    from importlib_metadata import version
-
-
-__version__ = version('rattail-tempmon')
+__version__ = '0.2.0'
diff --git a/rattail_tempmon/client.py b/rattail_tempmon/client.py
index 5173c67..2b154cb 100644
--- a/rattail_tempmon/client.py
+++ b/rattail_tempmon/client.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2023 Lance Edgar
+#  Copyright © 2010-2018 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -24,12 +24,15 @@
 TempMon client daemon
 """
 
+from __future__ import unicode_literals, absolute_import
+
 import time
 import datetime
 import random
 import socket
 import logging
 
+import six
 from sqlalchemy.exc import OperationalError
 from sqlalchemy.orm.exc import NoResultFound
 
@@ -83,16 +86,16 @@ class TempmonClient(Daemon):
         session = Session()
 
         try:
-            client = session.get(tempmon.Client, client_uuid)
+            client = session.query(tempmon.Client).get(client_uuid)
             self.delay = client.delay or 60
             if client.enabled:
                 for probe in client.enabled_probes():
                     self.take_reading(session, probe)
-                session.flush()
+            session.flush()
 
-                # one more thing, make sure our client appears "online"
-                if not client.online:
-                    client.online = True
+            # one more thing, make sure our client appears "online"
+            if not client.online:
+                client.online = True
 
         except Exception as error:
             log_error = True
@@ -108,7 +111,7 @@ class TempmonClient(Daemon):
                 # first time after DB stop.  but in the case of DB stop,
                 # subsequent errors will instead match the second test
                 if error.connection_invalidated or (
-                        'could not connect to server: Connection refused' in str(error)):
+                        'could not connect to server: Connection refused' in six.text_type(error)):
 
                     # only suppress logging for 3 failures, after that we let them go
                     # TODO: should make the max attempts configurable
@@ -116,7 +119,7 @@ class TempmonClient(Daemon):
                         log_error = False
                         log.debug("database connection failure #%s: %s",
                                   self.failed_checks,
-                                  str(error))
+                                  six.text_type(error))
 
             # send error email unless we're suppressing it for now
             if log_error:
@@ -134,28 +137,22 @@ class TempmonClient(Daemon):
         Take a single reading and add to Rattail database.
         """
         reading = tempmon.Reading()
+        reading.degrees_f = self.read_temp(probe)
 
-        try:
-            reading.degrees_f = self.read_temp(probe)
+        # a reading of 185.0 °F indicates some sort of power issue.  when this
+        # happens we log an error (which sends basic email) but do not record
+        # the temperature.  that way the server doesn't see the 185.0 reading
+        # and send out a "false alarm" about the temperature being too high.
+        # https://www.controlbyweb.com/support/faq/temp-sensor-reading-error.html
+        if reading.degrees_f == 185.0:
+            log.error("got reading of 185.0 from probe: %s", probe.description)
 
-        except:
-            log.exception("Failed to read temperature (but will keep trying) for probe: %s", probe)
-
-        else:
-            # a reading of 185.0 °F indicates some sort of power issue.  when this
-            # happens we log an error (which sends basic email) but do not record
-            # the temperature.  that way the server doesn't see the 185.0 reading
-            # and send out a "false alarm" about the temperature being too high.
-            # https://www.controlbyweb.com/support/faq/temp-sensor-reading-error.html
-            if reading.degrees_f == 185.0:
-                log.error("got reading of 185.0 from probe: %s", probe.description)
-
-            else: # we have a good reading
-                reading.client = probe.client
-                reading.probe = probe
-                reading.taken = datetime.datetime.utcnow()
-                session.add(reading)
-                return reading
+        else: # we have a good reading
+            reading.client = probe.client
+            reading.probe = probe
+            reading.taken = datetime.datetime.utcnow()
+            session.add(reading)
+            return reading
 
     def read_temp(self, probe):
         """
@@ -184,18 +181,7 @@ class TempmonClient(Daemon):
             return therm_file.readlines()
 
     def random_temp(self, probe):
-        last_reading = probe.last_reading()
-        if last_reading:
-            volatility = 2
-            # try to keep somewhat of a tight pattern, so graphs look reasonable
-            last_degrees = float(last_reading.degrees_f)
-            temp = random.uniform(last_degrees - volatility * 3, last_degrees + volatility * 3)
-            if temp > (probe.critical_temp_max + volatility * 2):
-                temp -= volatility
-            elif temp < (probe.critical_temp_min - volatility * 2):
-                temp += volatility
-        else:
-            temp = random.uniform(probe.critical_temp_min - 5, probe.critical_temp_max + 5)
+        temp = random.uniform(probe.critical_temp_min - 5, probe.critical_temp_max + 5)
         return round(temp, 4)
 
 
diff --git a/rattail_tempmon/commands.py b/rattail_tempmon/commands.py
index 29291f1..312c4d3 100644
--- a/rattail_tempmon/commands.py
+++ b/rattail_tempmon/commands.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2024 Lance Edgar
+#  Copyright © 2010-2017 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -24,157 +24,137 @@
 Tempmon commands
 """
 
+from __future__ import unicode_literals, absolute_import
+
 import datetime
 import logging
-from enum import Enum
-from pathlib import Path
 
-import typer
-from typing_extensions import Annotated
-
-from rattail.commands import rattail_typer
-from rattail.commands.typer import importer_command, typer_get_runas_user
-from rattail.commands.importing import ImportCommandHandler
+from rattail import commands
+from rattail.time import localtime, make_utc
 
 
 log = logging.getLogger(__name__)
 
 
-class ServiceAction(str, Enum):
-    start = 'start'
-    stop = 'stop'
-
-
-@rattail_typer.command()
-@importer_command
-def export_hotcooler(
-        ctx: typer.Context,
-        **kwargs
-):
+class ExportHotCooler(commands.ImportSubcommand):
     """
     Export data from Rattail-Tempmon to HotCooler
     """
-    config = ctx.parent.rattail_config
-    progress = ctx.parent.rattail_progress
-    handler = ImportCommandHandler(
-        config,
-        import_handler_spec='rattail_tempmon.hotcooler.importing.tempmon:FromTempmonToHotCooler')
-    kwargs['user'] = typer_get_runas_user(ctx)
-    handler.run(kwargs, progress=progress)
+    name = 'export-hotcooler'
+    description = __doc__.strip()
+    handler_spec = 'rattail_tempmon.hotcooler.importing.tempmon:FromTempmonToHotCooler'
 
 
-@rattail_typer.command()
-def purge_tempmon(
-        ctx: typer.Context,
-        keep_days: Annotated[
-            int,
-            typer.Option('--keep',
-                         help="Number of days for which data should be kept.")] = ...,
-        dry_run: Annotated[
-            bool,
-            typer.Option('--dry-run',
-                         help="Go through the full motions and allow logging etc. to "
-                         "occur, but rollback (abort) the transaction at the end.")] = False,
-):
+class PurgeTempmon(commands.Subcommand):
     """
     Purge stale data from Tempmon database
     """
-    config = ctx.parent.rattail_config
-    progress = ctx.parent.rattail_progress
-    do_purge(config, keep_days, dry_run=dry_run, progress=progress)
+    name = 'purge-tempmon'
+    description = __doc__.strip()
+
+    def add_parser_args(self, parser):
+        parser.add_argument('--keep', metavar='DAYS', required=True, type=int,
+                            help="Number of days for which data should be kept.")
+        parser.add_argument('--dry-run', action='store_true',
+                            help="Go through the full motions and allow logging etc. to "
+                            "occur, but rollback (abort) the transaction at the end.")
+
+    def run(self, args):
+        from rattail_tempmon.db import Session as TempmonSession, model as tempmon
+
+        cutoff = localtime(self.config).date() - datetime.timedelta(days=args.keep)
+        cutoff = localtime(self.config, datetime.datetime.combine(cutoff, datetime.time(0)))
+        session = TempmonSession()
+
+        readings = session.query(tempmon.Reading)\
+                          .filter(tempmon.Reading.taken < make_utc(cutoff))
+        count = readings.count()
+
+        def purge(reading, i):
+            session.delete(reading)
+            if i % 200 == 0:
+                session.flush()
+
+        self.progress_loop(purge, readings, count=count, message="Purging stale readings")
+        log.info("deleted {} stale readings".format(count))
+
+        if args.dry_run:
+            session.rollback()
+            log.info("dry run, so transaction was rolled back")
+        else:
+            session.commit()
+            log.info("transaction was committed")
+        session.close()
 
 
-@rattail_typer.command()
-def tempmon_client(
-        ctx: typer.Context,
-        action: Annotated[
-            ServiceAction,
-            typer.Argument(help="Action to perform for the service.")] = ...,
-        pidfile: Annotated[
-            Path,
-            typer.Option('--pidfile', '-p',
-                         help="Path to PID file.")] = None,
-        # TODO: deprecate / remove this
-        daemonize: Annotated[
-            bool,
-            typer.Option('--daemonize',
-                         help="Daemonize when starting.")] = False,
-):
+class TempmonClient(commands.Subcommand):
     """
     Manage the tempmon-client daemon
     """
-    from rattail_tempmon.client import make_daemon
+    name = 'tempmon-client'
+    description = __doc__.strip()
 
-    config = ctx.parent.rattail_config
-    daemon = make_daemon(config, pidfile)
-    if action == 'start':
-        daemon.start(daemonize)
-    elif action == 'stop':
-        daemon.stop()
+    def add_parser_args(self, parser):
+        subparsers = parser.add_subparsers(title='subcommands')
+
+        start = subparsers.add_parser('start', help="Start daemon")
+        start.set_defaults(subcommand='start')
+        stop = subparsers.add_parser('stop', help="Stop daemon")
+        stop.set_defaults(subcommand='stop')
+
+        parser.add_argument('-p', '--pidfile',
+                            help="Path to PID file.", metavar='PATH')
+        parser.add_argument('-D', '--daemonize', action='store_true',
+                            help="Daemonize when starting.")
+
+    def run(self, args):
+        from rattail_tempmon.client import make_daemon
+
+        daemon = make_daemon(self.config, args.pidfile)
+        if args.subcommand == 'start':
+            daemon.start(args.daemonize)
+        elif args.subcommand == 'stop':
+            daemon.stop()
 
 
-@rattail_typer.command()
-def tempmon_problems(
-        ctx: typer.Context,
-):
-    """
-    Email report(s) of various Tempmon data problems
-    """
-    from rattail_tempmon import problems
-
-    config = ctx.parent.rattail_config
-    progress = ctx.parent.rattail_progress
-    problems.disabled_probes(config, progress=progress)
-
-
-@rattail_typer.command()
-def tempmon_server(
-        ctx: typer.Context,
-        action: Annotated[
-            ServiceAction,
-            typer.Argument(help="Action to perform for the service.")] = ...,
-        pidfile: Annotated[
-            Path,
-            typer.Option('--pidfile', '-p',
-                         help="Path to PID file.")] = None,
-        # TODO: deprecate / remove this
-        daemonize: Annotated[
-            bool,
-            typer.Option('--daemonize',
-                         help="Daemonize when starting.")] = False,
-):
+class TempmonServer(commands.Subcommand):
     """
     Manage the tempmon-server daemon
     """
-    from rattail_tempmon.server import make_daemon
+    name = 'tempmon-server'
+    description = __doc__.strip()
 
-    config = ctx.parent.rattail_config
-    daemon = make_daemon(config, pidfile)
-    if action == 'start':
-        daemon.start(daemonize)
-    elif action == 'stop':
-        daemon.stop()
+    def add_parser_args(self, parser):
+        subparsers = parser.add_subparsers(title='subcommands')
+
+        start = subparsers.add_parser('start', help="Start daemon")
+        start.set_defaults(subcommand='start')
+        stop = subparsers.add_parser('stop', help="Stop daemon")
+        stop.set_defaults(subcommand='stop')
+
+        parser.add_argument('-p', '--pidfile',
+                            help="Path to PID file.", metavar='PATH')
+        parser.add_argument('-D', '--daemonize', action='store_true',
+                            help="Daemonize when starting.")
+
+    def run(self, args):
+        from rattail_tempmon.server import make_daemon
+
+        daemon = make_daemon(self.config, args.pidfile)
+        if args.subcommand == 'start':
+            daemon.start(args.daemonize)
+        elif args.subcommand == 'stop':
+            daemon.stop()
 
 
-def do_purge(config, keep_days, dry_run=False, progress=None):
-    from rattail_tempmon.db import Session, model
-    from rattail.db.util import finalize_session
+class TempmonProblems(commands.Subcommand):
+    """
+    Email report(s) of various Tempmon data problems
+    """
+    name = 'tempmon-problems'
+    description = __doc__.strip()
 
-    app = config.get_app()
-    cutoff = app.today() - datetime.timedelta(days=keep_days)
-    cutoff = app.localtime(datetime.datetime.combine(cutoff, datetime.time(0)))
-    session = Session()
+    def run(self, args):
+        from rattail_tempmon import problems
 
-    readings = session.query(model.Reading)\
-                      .filter(model.Reading.taken < app.make_utc(cutoff))\
-                      .all()
-
-    def purge(reading, i):
-        session.delete(reading)
-        if i % 200 == 0:
-            session.flush()
-
-    app.progress_loop(purge, readings, progress,
-                      message="Purging stale readings")
-    log.info("deleted %s stale readings", len(readings))
-    finalize_session(session, dry_run=dry_run)
+        problems.disabled_probes(self.config, progress=self.progress)
diff --git a/rattail_tempmon/config.py b/rattail_tempmon/config.py
index a5f1333..1c30d30 100644
--- a/rattail_tempmon/config.py
+++ b/rattail_tempmon/config.py
@@ -1,8 +1,8 @@
-# -*- coding: utf-8; -*-
+# -*- coding: utf-8 -*-
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2024 Lance Edgar
+#  Copyright © 2010-2017 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -24,13 +24,14 @@
 Tempmon config extension
 """
 
-from wuttjamaican.db import get_engines
-from wuttjamaican.conf import WuttaConfigExtension
+from __future__ import unicode_literals, absolute_import
 
+from rattail.config import ConfigExtension
+from rattail.db.config import get_engines
 from rattail_tempmon.db import Session
 
 
-class TempmonConfigExtension(WuttaConfigExtension):
+class TempmonConfigExtension(ConfigExtension):
     """
     Config extension for tempmon; adds tempmon DB engine/Session etc.  Expects
     something like this in your config:
@@ -52,10 +53,10 @@ class TempmonConfigExtension(WuttaConfigExtension):
     def configure(self, config):
 
         # tempmon
-        config.tempmon_engines = get_engines(config, 'rattail_tempmon.db')
+        config.tempmon_engines = get_engines(config, section='rattail_tempmon.db')
         config.tempmon_engine = config.tempmon_engines.get('default')
         Session.configure(bind=config.tempmon_engine)
 
         # hotcooler
-        config.hotcooler_engines = get_engines(config, 'hotcooler.db')
+        config.hotcooler_engines = get_engines(config, section='hotcooler.db')
         config.hotcooler_engine = config.hotcooler_engines.get('default')
diff --git a/rattail_tempmon/db/alembic/versions/fd1df160539a_make_enabled_datetime.py b/rattail_tempmon/db/alembic/versions/fd1df160539a_make_enabled_datetime.py
deleted file mode 100644
index 1a327f9..0000000
--- a/rattail_tempmon/db/alembic/versions/fd1df160539a_make_enabled_datetime.py
+++ /dev/null
@@ -1,80 +0,0 @@
-# -*- coding: utf-8; -*-
-"""make enabled datetime
-
-Revision ID: fd1df160539a
-Revises: a2676d3dfc1e
-Create Date: 2019-01-25 18:41:01.652823
-
-"""
-
-from __future__ import unicode_literals, absolute_import
-
-# revision identifiers, used by Alembic.
-revision = 'fd1df160539a'
-down_revision = 'a2676d3dfc1e'
-branch_labels = None
-depends_on = None
-
-import datetime
-from alembic import op
-import sqlalchemy as sa
-import rattail.db.types
-
-
-
-def upgrade():
-
-    now = datetime.datetime.utcnow()
-
-    # client
-    op.add_column('client', sa.Column('new_enabled', sa.DateTime(), nullable=True))
-    client = sa.sql.table('client',
-                          sa.sql.column('enabled'),
-                          sa.sql.column('new_enabled'))
-    op.execute(client.update()\
-               .where(client.c.enabled == True)\
-               .values({'new_enabled': now}))
-    op.drop_column('client', 'enabled')
-    op.alter_column('client', 'new_enabled', new_column_name='enabled')
-
-    # probe
-    op.add_column('probe', sa.Column('new_enabled', sa.DateTime(), nullable=True))
-    probe = sa.sql.table('probe',
-                         sa.sql.column('enabled'),
-                         sa.sql.column('new_enabled'))
-    op.execute(probe.update()\
-               .where(probe.c.enabled == True)\
-               .values({'new_enabled': now}))
-    op.drop_column('probe', 'enabled')
-    op.alter_column('probe', 'new_enabled', new_column_name='enabled')
-
-
-def downgrade():
-
-    # probe
-    op.add_column('probe', sa.Column('old_enabled', sa.Boolean(), nullable=True))
-    probe = sa.sql.table('probe',
-                         sa.sql.column('enabled'),
-                         sa.sql.column('old_enabled'))
-    op.execute(probe.update()\
-               .where(probe.c.enabled != None)\
-               .values({'old_enabled': True}))
-    op.execute(probe.update()\
-               .where(probe.c.enabled == None)\
-               .values({'old_enabled': False}))
-    op.drop_column('probe', 'enabled')
-    op.alter_column('probe', 'old_enabled', new_column_name='enabled', nullable=False)
-
-    # client
-    op.add_column('client', sa.Column('old_enabled', sa.Boolean(), nullable=True))
-    client = sa.sql.table('client',
-                          sa.sql.column('enabled'),
-                          sa.sql.column('old_enabled'))
-    op.execute(client.update()\
-               .where(client.c.enabled != None)\
-               .values({'old_enabled': True}))
-    op.execute(client.update()\
-               .where(client.c.enabled == None)\
-               .values({'old_enabled': False}))
-    op.drop_column('client', 'enabled')
-    op.alter_column('client', 'old_enabled', new_column_name='enabled', nullable=False)
diff --git a/rattail_tempmon/db/model.py b/rattail_tempmon/db/model.py
index 6fda2aa..4abbd29 100644
--- a/rattail_tempmon/db/model.py
+++ b/rattail_tempmon/db/model.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2023 Lance Edgar
+#  Copyright © 2010-2018 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -24,14 +24,14 @@
 Data models for tempmon
 """
 
+from __future__ import unicode_literals, absolute_import
+
 import datetime
 
+import six
 import sqlalchemy as sa
 from sqlalchemy import orm
-try:
-    from sqlalchemy.orm import declarative_base
-except ImportError:
-    from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.ext.declarative import declarative_base
 
 from rattail import enum
 from rattail.db.model import uuid_column
@@ -41,6 +41,7 @@ from rattail.db.model.core import ModelBase
 Base = declarative_base(cls=ModelBase)
 
 
+@six.python_2_unicode_compatible
 class Appliance(Base):
     """
     Represents an appliance which is monitored by tempmon.
@@ -80,6 +81,7 @@ class Appliance(Base):
         return self.name
 
 
+@six.python_2_unicode_compatible
 class Client(Base):
     """
     Represents a tempmon client.
@@ -109,11 +111,11 @@ class Client(Base):
     Any arbitrary notes for the client.
     """)
 
-    enabled = sa.Column(sa.DateTime(), nullable=True, doc="""
-    This will either be the date/time when the client was most recently
-    enabled, or null if it is not currently enabled.  If set, the client will
-    be expected to take readings (but only for "enabled" probes) and the server
-    will monitor them to ensure they are within the expected range etc.
+    enabled = sa.Column(sa.Boolean(), nullable=False, default=False, doc="""
+    Whether the client should be considered enabled (active).  If set, the
+    client will be expected to take readings (but only for "enabled" probes)
+    and the server will monitor them to ensure they are within the expected
+    range etc.
     """)
 
     online = sa.Column(sa.Boolean(), nullable=False, default=False, doc="""
@@ -137,6 +139,7 @@ class Client(Base):
         return [probe for probe in self.probes if probe.enabled]
 
 
+@six.python_2_unicode_compatible
 class Probe(Base):
     """
     Represents a probe connected to a tempmon client.
@@ -175,7 +178,6 @@ class Probe(Base):
         """,
         backref=orm.backref(
             'probes',
-            order_by='Probe.description',
             doc="""
             List of probes which monitor this appliance.
             """))
@@ -189,13 +191,7 @@ class Probe(Base):
     """)
 
     device_path = sa.Column(sa.String(length=255), nullable=True)
-
-    enabled = sa.Column(sa.DateTime(), nullable=True, doc="""
-    This will either be the date/time when the probe was most recently enabled,
-    or null if it is not currently enabled.  If set, the client will be
-    expected to take readings for this probe, and the server will monitor them
-    to ensure they are within the expected range etc.
-    """)
+    enabled = sa.Column(sa.Boolean(), nullable=False, default=True)
 
     critical_temp_max = sa.Column(sa.Integer(), nullable=False, doc="""
     Maximum high temperature; when a reading is greater than or equal to this
@@ -301,16 +297,6 @@ class Probe(Base):
     def __str__(self):
         return self.description
 
-    def last_reading(self):
-        """
-        Returns the reading which was taken most recently for this probe.
-        """
-        session = orm.object_session(self)
-        return session.query(Reading)\
-                      .filter(Reading.probe == self)\
-                      .order_by(Reading.taken.desc())\
-                      .first()
-
     def start_status(self, status, time):
         """
         Update the "started" timestamp field for the given status.  This is
@@ -396,6 +382,7 @@ class Probe(Base):
             return self.error_timeout
 
 
+@six.python_2_unicode_compatible
 class Reading(Base):
     """
     Represents a single temperature reading from a tempmon probe.
@@ -426,7 +413,6 @@ class Reading(Base):
         """,
         backref=orm.backref(
             'readings',
-            order_by='Reading.taken',
             cascade='all, delete-orphan'))
 
     taken = sa.Column(sa.DateTime(), nullable=False, default=datetime.datetime.utcnow)
diff --git a/rattail_tempmon/emails.py b/rattail_tempmon/emails.py
index 4a3b5cf..11256c8 100644
--- a/rattail_tempmon/emails.py
+++ b/rattail_tempmon/emails.py
@@ -40,22 +40,17 @@ class TempmonBase(object):
     
     def sample_data(self, request):
         now = localtime(self.config)
-        client = tempmon.Client(config_key='testclient', hostname='testclient')
-        probe = tempmon.Probe(config_key='testprobe', description="Test Probe",
-                              good_max_timeout=45)
+        client = model.TempmonClient(config_key='testclient', hostname='testclient')
+        probe = model.TempmonProbe(config_key='testprobe', description="Test Probe")
         client.probes.append(probe)
         return {
             'client': client,
             'probe': probe,
-            'probe_url': '#',
             'status': self.enum.TEMPMON_PROBE_STATUS[self.enum.TEMPMON_PROBE_STATUS_ERROR],
-            'reading': tempmon.Reading(),
+            'reading': model.TempmonReading(),
             'taken': now,
             'now': now,
-            'status_since': now.strftime('%I:%M %p'),
-            'status_since_delta': 'now',
-            'recent_minutes': 90,
-            'recent_readings': [],
+            'probe_url': '#',
         }
 
 
@@ -83,6 +78,19 @@ class tempmon_critical_low_temp(TempmonBase, Email):
         return data
 
 
+class tempmon_critical_temp(TempmonBase, Email):
+    """
+    Sent when a tempmon probe takes a reading which is "critical" in either the
+    high or low sense.
+    """
+    default_subject = "Critical temperature detected"
+    
+    def sample_data(self, request):
+        data = super(tempmon_critical_temp, self).sample_data(request)
+        data['status'] = self.enum.TEMPMON_PROBE_STATUS[self.enum.TEMPMON_PROBE_STATUS_CRITICAL_TEMP]
+        return data
+
+
 class tempmon_error(TempmonBase, Email):
     """
     Sent when a tempmon probe is noticed to have some error, i.e. no current readings.
diff --git a/rattail_tempmon/problems.py b/rattail_tempmon/problems.py
index 087ceb1..edb28af 100644
--- a/rattail_tempmon/problems.py
+++ b/rattail_tempmon/problems.py
@@ -37,13 +37,13 @@ def disabled_probes(config, progress=None):
     tempmon_session = TempmonSession()
     clients = tempmon_session.query(tempmon.Client)\
                              .filter(tempmon.Client.archived == False)\
-                             .filter(tempmon.Client.enabled == None)\
+                             .filter(tempmon.Client.enabled == False)\
                              .all()
     probes = tempmon_session.query(tempmon.Probe)\
                             .join(tempmon.Client)\
                             .filter(tempmon.Client.archived == False)\
-                            .filter(tempmon.Client.enabled != None)\
-                            .filter(tempmon.Probe.enabled == None)\
+                            .filter(tempmon.Client.enabled == True)\
+                            .filter(tempmon.Probe.enabled == False)\
                             .all()
     if clients or probes:
         send_email(config, 'tempmon_disabled_probes', {
diff --git a/rattail_tempmon/server.py b/rattail_tempmon/server.py
index a54614a..4c290bd 100644
--- a/rattail_tempmon/server.py
+++ b/rattail_tempmon/server.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2024 Lance Edgar
+#  Copyright © 2010-2018 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -24,10 +24,13 @@
 Tempmon server daemon
 """
 
+from __future__ import unicode_literals, absolute_import
+
 import time
 import datetime
 import logging
 
+import six
 import humanize
 from sqlalchemy import orm
 from sqlalchemy.exc import OperationalError
@@ -68,7 +71,7 @@ class TempmonServerDaemon(Daemon):
 
         try:
             clients = session.query(tempmon.Client)\
-                             .filter(tempmon.Client.enabled != None)\
+                             .filter(tempmon.Client.enabled == True)\
                              .filter(tempmon.Client.archived == False)
             for client in clients:
                 self.check_readings_for_client(session, client)
@@ -88,7 +91,7 @@ class TempmonServerDaemon(Daemon):
                 # first time after DB stop.  but in the case of DB stop,
                 # subsequent errors will instead match the second test
                 if error.connection_invalidated or (
-                        'could not connect to server: Connection refused' in str(error)):
+                        'could not connect to server: Connection refused' in six.text_type(error)):
 
                     # only suppress logging for 3 failures, after that we let them go
                     # TODO: should make the max attempts configurable
@@ -96,7 +99,7 @@ class TempmonServerDaemon(Daemon):
                         log_error = False
                         log.debug("database connection failure #%s: %s",
                                   self.failed_checks,
-                                  str(error))
+                                  six.text_type(error))
 
             # send error email unless we're suppressing it for now
             if log_error:
@@ -119,24 +122,10 @@ class TempmonServerDaemon(Daemon):
         # the client to be (possibly) offline.
         delay = client.delay or 60
         cutoff = self.now - datetime.timedelta(seconds=delay + 60)
-
-        # but if client was "just now" enabled, cutoff may not be quite fair.
-        # in this case we'll just skip checks until cutoff does seem fair.
-        if cutoff < client.enabled:
-            return
-
-        # we make similar checks for each probe; if cutoff "is not fair" for
-        # any of them, we'll skip that probe check, and avoid marking client
-        # offline for this round, just to be safe
         online = False
-        cutoff_unfair = False
         for probe in client.enabled_probes():
-            if cutoff < probe.enabled:
-                cutoff_unfair = True
-            elif self.check_readings_for_probe(session, probe, cutoff):
+            if self.check_readings_for_probe(session, probe, cutoff):
                 online = True
-        if cutoff_unfair:
-            return
 
         # if client was previously marked online, but we have no "new"
         # readings, then let's look closer to see if it's been long enough to
@@ -219,13 +208,13 @@ class TempmonServerDaemon(Daemon):
                 and prev_status in (self.enum.TEMPMON_PROBE_STATUS_CRITICAL_HIGH_TEMP,
                                     self.enum.TEMPMON_PROBE_STATUS_CRITICAL_TEMP)
                 and prev_alert_sent):
-                self.send_email(status, 'tempmon_high_temp', data)
+                send_email(self.config, 'tempmon_high_temp', data)
                 probe.status_alert_sent = self.now
                 return
 
             # send email when things go back to normal (i.e. from any other status)
             if status == self.enum.TEMPMON_PROBE_STATUS_GOOD_TEMP and prev_alert_sent:
-                self.send_email(status, 'tempmon_good_temp', data)
+                send_email(self.config, 'tempmon_good_temp', data)
                 probe.status_alert_sent = self.now
                 return
 
@@ -240,24 +229,8 @@ class TempmonServerDaemon(Daemon):
                 return
 
         # delay even the first email, until configured threshold is reached
-        timeout = probe.timeout_for_status(status)
-        if timeout is None:
-            if status == self.enum.TEMPMON_PROBE_STATUS_CRITICAL_HIGH_TEMP:
-                timeout = self.config.getint('rattail_tempmon', 'probe.default.critical_max_timeout',
-                                             default=0)
-            elif status == self.enum.TEMPMON_PROBE_STATUS_HIGH_TEMP:
-                timeout = self.config.getint('rattail_tempmon', 'probe.default.good_max_timeout',
-                                             default=0)
-            elif status == self.enum.TEMPMON_PROBE_STATUS_LOW_TEMP:
-                timeout = self.config.getint('rattail_tempmon', 'probe.default.good_min_timeout',
-                                             default=0)
-            elif status == self.enum.TEMPMON_PROBE_STATUS_CRITICAL_LOW_TEMP:
-                timeout = self.config.getint('rattail_tempmon', 'probe.default.critical_min_timeout',
-                                             default=0)
-            elif status == self.enum.TEMPMON_PROBE_STATUS_ERROR:
-                timeout = self.config.getint('rattail_tempmon', 'probe.default.error_timeout',
-                                             default=0)
-        timeout = datetime.timedelta(minutes=timeout or 0)
+        timeout = probe.timeout_for_status(status) or 0
+        timeout = datetime.timedelta(minutes=timeout)
         started = probe.status_started(status) or probe.status_changed
         if (self.now - started) <= timeout:
             return
diff --git a/rattail_tempmon/settings.py b/rattail_tempmon/settings.py
deleted file mode 100644
index 18172bb..0000000
--- a/rattail_tempmon/settings.py
+++ /dev/null
@@ -1,88 +0,0 @@
-# -*- coding: utf-8; -*-
-################################################################################
-#
-#  Rattail -- Retail Software Framework
-#  Copyright © 2010-2018 Lance Edgar
-#
-#  This file is part of Rattail.
-#
-#  Rattail is free software: you can redistribute it and/or modify it under the
-#  terms of the GNU General Public License as published by the Free Software
-#  Foundation, either version 3 of the License, or (at your option) any later
-#  version.
-#
-#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
-#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
-#  details.
-#
-#  You should have received a copy of the GNU General Public License along with
-#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
-#
-################################################################################
-"""
-Rattail Tempmon Settings
-"""
-
-from __future__ import unicode_literals, absolute_import
-
-from rattail.settings import Setting
-
-
-##############################
-# TempMon
-##############################
-
-class rattail_tempmon_probe_default_critical_max_timeout(Setting):
-    """
-    Default value to be used as Critical High Timeout value, for any probe
-    which does not have this timeout defined.
-    """
-    group = "TempMon"
-    namespace = 'rattail_tempmon'
-    name = 'probe.default.critical_max_timeout'
-    data_type = int
-
-
-class rattail_tempmon_probe_default_critical_min_timeout(Setting):
-    """
-    Default value to be used as Critical Low Timeout value, for any probe which
-    does not have this timeout defined.
-    """
-    group = "TempMon"
-    namespace = 'rattail_tempmon'
-    name = 'probe.default.critical_min_timeout'
-    data_type = int
-
-
-class rattail_tempmon_probe_default_error_timeout(Setting):
-    """
-    Default value to be used as Error Timeout value, for any probe which does
-    not have this timeout defined.
-    """
-    group = "TempMon"
-    namespace = 'rattail_tempmon'
-    name = 'probe.default.error_timeout'
-    data_type = int
-
-
-class rattail_tempmon_probe_default_good_max_timeout(Setting):
-    """
-    Default value to be used as High Timeout value, for any probe which does
-    not have this timeout defined.
-    """
-    group = "TempMon"
-    namespace = 'rattail_tempmon'
-    name = 'probe.default.good_max_timeout'
-    data_type = int
-
-
-class rattail_tempmon_probe_default_good_min_timeout(Setting):
-    """
-    Default value to be used as Low Timeout value, for any probe which does not
-    have this timeout defined.
-    """
-    group = "TempMon"
-    namespace = 'rattail_tempmon'
-    name = 'probe.default.good_min_timeout'
-    data_type = int
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..2c7d7cf
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,111 @@
+# -*- coding: utf-8; -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2017 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail is free software: you can redistribute it and/or modify it under the
+#  terms of the GNU General Public License as published by the Free Software
+#  Foundation, either version 3 of the License, or (at your option) any later
+#  version.
+#
+#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
+#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+#  details.
+#
+#  You should have received a copy of the GNU General Public License along with
+#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+setup script for rattail-tempmon
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+import os
+from setuptools import setup, find_packages
+
+
+here = os.path.abspath(os.path.dirname(__file__))
+exec(open(os.path.join(here, 'rattail_tempmon', '_version.py')).read())
+README = open(os.path.join(here, 'README.rst')).read()
+
+
+requires = [
+    #
+    # Version numbers within comments below have specific meanings.
+    # Basically the 'low' value is a "soft low," and 'high' a "soft high."
+    # In other words:
+    #
+    # If either a 'low' or 'high' value exists, the primary point to be
+    # made about the value is that it represents the most current (stable)
+    # version available for the package (assuming typical public access
+    # methods) whenever this project was started and/or documented.
+    # Therefore:
+    #
+    # If a 'low' version is present, you should know that attempts to use
+    # versions of the package significantly older than the 'low' version
+    # may not yield happy results.  (A "hard" high limit may or may not be
+    # indicated by a true version requirement.)
+    #
+    # Similarly, if a 'high' version is present, and especially if this
+    # project has laid dormant for a while, you may need to refactor a bit
+    # when attempting to support a more recent version of the package.  (A
+    # "hard" low limit should be indicated by a true version requirement
+    # when a 'high' version is present.)
+    #
+    # In any case, developers and other users are encouraged to play
+    # outside the lines with regard to these soft limits.  If bugs are
+    # encountered then they should be filed as such.
+    #
+    # package                           # low                   high
+
+    'rattail[db]',                      # 0.7.46
+    'six',                              # 1.10.0
+    'sqlsoup',                          # 0.9.1
+]
+
+
+setup(
+    name = "rattail-tempmon",
+    version = __version__,
+    author = "Lance Edgar",
+    author_email = "lance@edbob.org",
+    url = "https://rattailproject.org/",
+    license = "GNU GPL v3",
+    description = "Retail Software Framework - Temperature monitoring add-on",
+    long_description = README,
+
+    classifiers = [
+        'Development Status :: 3 - Alpha',
+        'Intended Audience :: Developers',
+        'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
+        'Natural Language :: English',
+        'Operating System :: OS Independent',
+        'Programming Language :: Python',
+        'Programming Language :: Python :: 2.7',
+        'Topic :: Office/Business',
+        'Topic :: Software Development :: Libraries :: Python Modules',
+    ],
+
+    install_requires = requires,
+    packages = find_packages(),
+    include_package_data = True,
+
+    entry_points = {
+        'rattail.commands': [
+            'export-hotcooler = rattail_tempmon.commands:ExportHotCooler',
+            'purge-tempmon = rattail_tempmon.commands:PurgeTempmon',
+            'tempmon-client = rattail_tempmon.commands:TempmonClient',
+            'tempmon-problems = rattail_tempmon.commands:TempmonProblems',
+            'tempmon-server = rattail_tempmon.commands:TempmonServer',
+        ],
+        'rattail.config.extensions': [
+            'tempmon = rattail_tempmon.config:TempmonConfigExtension',
+        ],
+    },
+)
diff --git a/tasks.py b/tasks.py
index 497f721..09eca73 100644
--- a/tasks.py
+++ b/tasks.py
@@ -2,7 +2,7 @@
 ################################################################################
 #
 #  Rattail -- Retail Software Framework
-#  Copyright © 2010-2024 Lance Edgar
+#  Copyright © 2010-2018 Lance Edgar
 #
 #  This file is part of Rattail.
 #
@@ -24,20 +24,17 @@
 Tasks for 'rattail-tempmon' package
 """
 
-import os
+from __future__ import unicode_literals, absolute_import
+
 import shutil
 
 from invoke import task
 
 
 @task
-def release(c):
+def release(ctx):
     """
     Release a new version of `rattail-tempmon`
     """
-    if os.path.exists('dist'):
-        shutil.rmtree('dist')
-    if os.path.exists('rattail_tempmon.egg-info'):
-        shutil.rmtree('rattail_tempmon.egg-info')
-    c.run('python -m build --sdist')
-    c.run('twine upload dist/*')
+    shutil.rmtree('rattail_tempmon.egg-info')
+    ctx.run('python setup.py sdist --formats=gztar upload')