Merge branch 'db_persistence' into 'master'

Db persistence See merge request Guille/hub!44
2023-01-09 21:56:46 +00:00 · 2023-01-09 21:56:46 +00:00 · 609ad59371
commit 609ad59371
parent 2ad54940ab 4bf2ff4ff0
37 changed files with 2821 additions and 1941 deletions
--- a/.env
+++ b/.env
@ -0,0 +1,16 @@
+# production database credentials
+PROD_DB_USER=postgres
+PROD_DB_PASSWORD=
+PROD_DB_HOST=localhost
+PROD_DB_PORT=5432
+
+# test database credentials
+TEST_DB_USER=postgres
+TEST_DB_PASSWORD=postgres
+TEST_DB_HOST=localhost
+TEST_DB_PORT=5432
+
+#Gitlab token
+HUB_TOKEN=9s_CJYh5TcWhyYL416MM
+
+DEV_SECRET_NAME=dp.st.dev.Axvak1ILOlCOwUNGajv7fg5VPaacFR6OL1kdb3YGWHX
--- a/.gitignore
+++ b/.gitignore
@ -5,4 +5,6 @@
 /data/energy_systems/heat_pumps/*.csv
 /data/energy_systems/heat_pumps/*.insel
 .DS_Store
+.env
+logs
 **/__pycache__/
--- a/DEPLOYMENT.md
+++ b/DEPLOYMENT.md
@ -0,0 +1,66 @@
+## Installing PostgreSQL Database Server on Linux (Ubuntu) ##
+Execute the *install_postgresql_linux.sh* script to install PostgreSQL database
+*NB: PostgreSQL DB Server runs on a default port of 5432.*
+
+## Installing PostgreSQL Database Server on Windows ##
+1. Download a Windows installer from [this link](https://www.enterprisedb.com/downloads/postgres-postgresql-downloads).
+2. Double click on the installer file and follow the prompts of the installation wizard
+3. On the component selection page of the installation wizard make sure to select *PostgreSQL Server and Commandline tools*
+4. You can optionally select pgAdmin 4 to install a graphical UI to access your database
+5. On the password page when prompted, enter the default password (postgres) and confirm it
+6. You can change the default password of 5432 on the port page. You should ensure that whatever port number you
+provide is not used by another service.
+7. Follow the installation wizard prompt to complete your installation. You can verify your installation by
+searching for the *psql* tool from your start menu
+
+## Installing PostgreSQL Database Server on Mac OS X ##
+1. Download the Mac OS X installer from [this link](https://www.enterprisedb.com/downloads/postgres-postgresql-downloads).
+2. Launch the installation wizard by double-clicking it and follow the rest of steps as described above on 
+Installing PostgreSQL Database Server on Windows.
+
+NB: Hub has been tested with version 15 of PostgreSQL
+
+## Create Database and Database User ##
+1. Connect to the PostgreSQL database server via psql by executing `sudo -u postgres psql`. You will be
+be prompted for a password, the default password of *postgres* user is *postgres*. The above command may not work on 
+a Windows system using the default command line tool. You can access the psql tool from Windows start menu and follow 
+the rest of the instructions from step 2 below
+2. Execute `create user <username> with encrypted password '<password>';` in the psql console to create a user.
+3. Execute `create database <database-name>;` in the psql console to create a database.
+4. Execute `grant all privileges on database <database-name> to <username>;` to grant the all privileges on the database
+to the user created in step 2 above. 
+5. The created database by default, has on schema named public which you can use. However, if you wish to create
+another schema, you can do so by following [this link](https://www.postgresqltutorial.com/postgresql-administration/postgresql-create-schema/).
+
+**NB: You can grant selected privileges to the user on the database using commands  [on this page](https://tableplus.com/blog/2018/04/postgresql-how-to-grant-access-to-users.html).*
+The user should however have read and write permission to all tables in the database. You can as well create a database and user using the PgAdmin UI tool*
+
+## Setting Up Database Connection Parameters
+1. Create a .env file that contains the configuration parameters as explained in the *Database Configuration Parameters*
+section in persistence/README.md file.
+2. The .env file should contain the following credentials: database user, database password, database host an,d database port
+3. Provide the *absolute path* to the .env file to the persistence importers and exporters whenever using them in your code
+as shown below:
+```python
+from exports.db_factory import DBFactory
+from pathlib import Path
+
+dotenv_path = (Path(__file__).parent / '.env').resolve()
+factory = DBFactory(db_name='hub_db', app_env='PROD', dotenv_path=dotenv_path)
+```
+
+
+## Create Database Tables ##
+Use the *DBSetup* class in the persistence package to create the required database tables as described below
+```python
+from persistence import DBSetup
+from pathlib import Path
+
+dotenv_path = (Path(__file__).parent / '.env').resolve()
+DBSetup(db_name='hub_db', app_env='PROD', dotenv_path=dotenv_path)
+```
+The *DBSetUp* class also creates a default admin user with default credentials that can be changed.
+with the import UserFactory class. The admin user (name, email, password and role) is logged into the console after it is created by the 
+*constructor of DBSetup*. Use can also manage users (create, read, update and delete) with user import and export factories.
+
+**NB: Make sure to change the default admin user credentials**
--- a/city_model_structure/city.py
+++ b/city_model_structure/city.py
@ -14,7 +14,6 @@ import pyproj
 from typing import List, Union
 from pyproj import Transformer
 from pathlib import Path
-
 from city_model_structure.building import Building
 from city_model_structure.city_object import CityObject
 from city_model_structure.city_objects_cluster import CityObjectsCluster
@ -96,7 +95,7 @@ class City:
  @property
  def country_code(self):
    """
-    Get city country code
+    Get models country code
    :return: str
    """
    return self._get_location().country
@ -290,11 +289,12 @@ class City:
    selected_region_upper_corner = [center[0] + radius, center[1] + radius, center[2] + radius]
    selected_region_city = City(selected_region_lower_corner, selected_region_upper_corner, srs_name=self.srs_name)
    selected_region_city.climate_file = self.climate_file
+    #    selected_region_city.climate_reference_city = self.climate_reference_city
    for city_object in self.city_objects:
      location = city_object.centroid
      if location is not None:
-        distance = math.sqrt(math.pow(location[0]-center[0], 2) + math.pow(location[1]-center[1], 2)
-                             + math.pow(location[2]-center[2], 2))
+        distance = math.sqrt(math.pow(location[0] - center[0], 2) + math.pow(location[1] - center[1], 2)
+                             + math.pow(location[2] - center[2], 2))
        if distance < radius:
          selected_region_city.add_city_object(city_object)
    return selected_region_city
--- a/data/energy_systems/heat_pumps/constants.yaml
+++ b/data/energy_systems/heat_pumps/constants.yaml
@ -13,13 +13,12 @@ Cp: 4190
 Rhow: 1000
 TESDiameter: 5
 AuxHeaterEfficiency: 0.9
-
+HPNominalCapacity: 256
 # These come from the data model according to other student's work
 ElecGridEF: 0.5
 ElectricityPrice: 0.073

 # Water to Water HP constants
-HPNominalCapacity: 256
 LowestPossibleLoadFlow: 4.73
 HighestPossibleLoadFlow: 9.46

--- a/data/energy_systems/heat_pumps/w2w_parallel.txt
+++ b/data/energy_systems/heat_pumps/w2w_parallel.txt
--- a/data/energy_systems/heat_pumps/w2w_series.txt
+++ b/data/energy_systems/heat_pumps/w2w_series.txt
--- a/exports/db_factory.py
+++ b/exports/db_factory.py
@ -0,0 +1,46 @@
+"""
+DBFactory performs read related operations
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project CoderPeter Yefi peteryefi@gmail.com
+"""
+from persistence import CityRepo
+from persistence import HeatPumpSimulationRepo
+
+
+class DBFactory:
+  """
+  DBFactory class
+  """
+
+  def __init__(self, db_name, app_env, dotenv_path):
+    self._city_repo = CityRepo(db_name=db_name, app_env=app_env, dotenv_path=dotenv_path)
+    self._hp_simulation_repo = HeatPumpSimulationRepo(db_name=db_name, app_env=app_env, dotenv_path=dotenv_path)
+
+  def get_city(self, city_id):
+    """
+    Retrieve a single city from postgres
+    :param city_id: the id of the city to get
+    """
+    return self._city_repo.get_by_id(city_id)
+
+  def get_city_by_name(self, city_name):
+    """
+    Retrieve a single city from postgres
+    :param city_name: the name of the city to get
+    """
+    return self._city_repo.get_by_name(city_name)
+
+  def get_hp_simulation(self, hp_sim_id: int):
+    """
+    Retrieve a single heat pump simulation from postgres
+    :param hp_sim_id: the id of the heat pump to get
+    """
+    return self._hp_simulation_repo.get_by_id(hp_sim_id)
+
+  def get_hp_simulation_by_city(self, city_id: int):
+    """
+    Retrieve a single city from postgres
+    :param city_id: the id of the city
+    """
+    return self._hp_simulation_repo.get_by_city(city_id)
--- a/exports/energy_systems/air_source_hp_export.py
+++ b/exports/energy_systems/air_source_hp_export.py
@ -6,7 +6,7 @@ Copyright © 2022 Concordia CERC group
 Project Coder Peter Yefi peteryefi@gmail.com
 """
 from exports.energy_systems.heat_pump_export import HeatPumpExport
-from typing import List, Tuple, Union
+from typing import List, Dict, Union


 class AirSourceHPExport(HeatPumpExport):
@ -15,17 +15,18 @@ class AirSourceHPExport(HeatPumpExport):
  after executing insel
  """

-  def __init__(self, base_path, city, output_path, sim_type):
+  def __init__(self, base_path, city, output_path, sim_type, demand_path=None):
    """

    :param base_path: path to energy system files
    :param city: the city object
    :param output_path: the file to hold insel simulation results
    :param sim_type: the simulation type to run: 0 for series, 1 for parallel
+    :param demand_path: path to hourly energy demand file
    """
    tmp_file = 'heat_pumps/as_series.txt' if sim_type == 0 else 'heat_pumps/as_parallel.txt'
    template_path = (base_path / tmp_file)
-    super().__init__(base_path, city, output_path, template_path)
+    super().__init__(base_path, city, output_path, template_path, demand_path)

  def _extract_model_coff(self, hp_model: str, data_type='heat') -> Union[List, None]:
    """
@ -43,7 +44,7 @@ class AirSourceHPExport(HeatPumpExport):
        return energy_system.air_source_hp.cooling_capacity_coff
    return None

-  def execute_insel(self, user_input, hp_model, data_type):
+  def execute_insel(self, user_input, hp_model, data_type) -> Union[Dict, None]:
    """
    Runs insel and produces output files
    Runs insel and write the necessary files
@ -54,7 +55,6 @@ class AirSourceHPExport(HeatPumpExport):
    :param data_type: a string that indicates whether
    insel should run for heat or cooling performance
    :return:
-    :return:
    """
    capacity_coeff = self._extract_model_coff(hp_model, data_type)
-    super(AirSourceHPExport, self)._run_insel(user_input, capacity_coeff, 'air_source.insel')
+    return super(AirSourceHPExport, self)._run_insel(user_input, capacity_coeff, 'air_source.insel')
--- a/exports/energy_systems/heat_pump_export.py
+++ b/exports/energy_systems/heat_pump_export.py
@ -5,7 +5,7 @@ Copyright © 2022 Concordia CERC group
 Project Coder Peter Yefi peteryefi@gmail.com
 """
 import os
-from typing import List, Tuple, Union, Dict
+from typing import List, Union, Dict
 import yaml
 from string import Template
 import pandas as pd
@ -17,18 +17,18 @@ class HeatPumpExport:
  of some defined function
  """

-  def __init__(self, base_path, city, output_path, template, water_temp=None):
+  def __init__(self, base_path, city, output_path, template, demand_path=None, water_temp=None):
    self._template_path = template
    self._water_temp = water_temp
    self._constants_path = (base_path / 'heat_pumps/constants.yaml')
    # needed to compute max demand.
-    self._demand_path = (base_path / 'heat_pumps/demand.txt')
+    self._demand_path = (base_path / 'heat_pumps/demand.txt') if demand_path is None else demand_path
    self._city = city
    self._input_data = None
    self._base_path = base_path
    self._output_path = output_path

-  def _run_insel(self, user_input: Dict, capacity_coeff: List, filename: str) -> None:
+  def _run_insel(self, user_input: Dict, capacity_coeff: List, filename: str) -> Union[Dict, None]:
    """
    Runs insel and write the necessary files
    :param user_input: a dictionary containing the user
@ -56,11 +56,11 @@ class HeatPumpExport:
      insel_file_handler.write(insel_template)
      # Now run insel
      self._delete_existing_output_files()
-      os.system('insel {}'.format(insel_file))
+      os.system('/usr/local/bin/insel {}'.format(insel_file))
      # Writer headers to csv output files generated by insel
      self._write_insel_output_headers()
      # User output
-      self._get_user_out_put()
+      return self._get_user_out_put()
    except IOError as err:
      print("I/O exception: {}".format(err))
    finally:
@ -72,17 +72,33 @@ class HeatPumpExport:
    Write headers to the various csv file generated by insel
    :return:
    """
+    header = [
+      'Year', ' Month', ' Day', 'Hour', 'Minute', 'HP Heat Output (kW)', 'Heating Demand (kW)', 'HP output flow rate',
+      'Building Required Flow Rate', 'TES Charging Rate (kg/s)', 'Water Flow Rate After Splitter',
+      'water temperature after splitter', 'TES Discharging Rate (kg/s)', 'TES discharge temperature',
+      'Mixer Outlet Flow Rate (kg/s)', 'Mixer outlet temperature', 'Auxiliary heater fuel flow rate',
+      'Auxiliary heater energy input (kW)', 'Building Inlet Flow Rate (kg/s)', 'Building inlet temperature',
+      'Building return temperature', 'TES Return Flow Rate (kg/s)', 'TES return temperature',
+      'TES Bypass Line Flow Rate (kg/s)', 'TES bypass line temperature', 'Flow Rate from TES to mixer 2 (kg/s)',
+      'Temperature from Tes to mixer', 'HP Inlet Flow Rate (kg/s)', 'HP Inlet temperature', 'TES Node 1 Temperature',
+      'TES Node 2 Temperature', 'TES Node 3 Temperature', 'TES Node 4 Temperature', 'TES Energy Content (J)',
+      'HP Electricity Consumption (kW)', 'HP COP', 'Ambient Temperature', 'HP Operational Cost (CAD)',
+      'Auxiliary Heater Operational Cost (CAD)', 'Operational CO2 Emissions of HP (g)',
+      'Operational CO2 Emissions of Auxiliary Heater (g)']
+    if 'series' in str(self._template_path):
+      header = [
+        'Year', ' Month', ' Day', 'Hour', 'Minute', 'HP Heat Output (kW)',
+        'HP Electricity Consumption (kW)', 'HP COP', 'TES Charging Rate (kg/s)',
+        'TES Discharging Rate (kg/s)', 'TES Node 1 Temperature', 'TES Node 2 Temperature',
+        'TES Node 3 Temperature', 'TES Node 4 Temperature', 'TES Energy Content (J)',
+        'TES Energy Content (kWh)', 'TES Energy Content Variation (kWh)',
+        'Auxiliary Heater Fuel Flow Rate (kg/s)', 'Auxiliary Heater Energy Input (kW)',
+        'HP Operational Cost (CAD)', 'Auxiliary Heater Operational Cost (CAD)',
+        'Operational CO2 Emissions of HP (g)',
+        'Operational CO2 Emissions of Auxiliary Heater (g)',
+        'Return Temperature', 'Demand (kW)']
    header_data = {
-      self._input_data['fileOut1']: ['Year', ' Month', ' Day', 'Hour', 'Minute', 'HP Heat Output (kW)',
-                                     'HP Electricity Consumption (kW)', 'HP COP', 'TES Charging Rate (kg/s)',
-                                     'TES Discharging Rate (kg/s)', 'TES Node 1 Temperature', 'TES Node 2 Temperature',
-                                     'TES Node 3 Temperature', 'TES Node 4 Temperature', 'TES Energy Content (J)',
-                                     'TES Energy Content (kWh)', 'TES Energy Content Variation (kWh)',
-                                     'Auxiliary Heater Fuel Flow Rate (kg/s)', 'Auxiliary Heater Energy Input (kW)',
-                                     'HP Operational Cost (CAD)', 'Auxiliary Heater Operational Cost (CAD)',
-                                     'Operational CO2 Emissions of HP (g)',
-                                     'Operational CO2 Emissions of Auxiliary Heater (g)',
-                                     'Return Temperature', 'Demand (kW)'],
+      self._input_data['fileOut1']: header,
      self._input_data['fileOut2']: ['Day', 'Operational Daily Emissions from Heat Pumps (g)',
                                     'Operational Daily Emissions from Auxiliary Heater (g)'],
      self._input_data['fileOut3']: ['Month', 'Monthly Operational Costs of Heat Pumps (CAD)',
@ -102,7 +118,7 @@ class HeatPumpExport:
      file_path = file_path.strip("'")
      df = pd.read_csv(file_path, header=None, sep='\s+')
      # ignore ambient temperature for air source series run
-      if df.shape[1] > 25:
+      if df.shape[1] > 25 and 'series' in str(self._template_path):
        df.drop(columns=df.columns[-1],
                axis=1,
                inplace=True)
@ -161,6 +177,8 @@ class HeatPumpExport:
    with open(self._constants_path) as file:
      constants_dict = yaml.load(file, Loader=yaml.FullLoader)
      for key, value in constants_dict.items():
+        if key in ['LowestPossibleLoadFlow', 'HighestPossibleLoadFlow'] and self._water_temp is None:
+          continue
        self._input_data[key] = value
    # compute water to water HP specific values
    if 55 <= self._input_data['HPSupTemp'] <= 60:
@ -206,19 +224,30 @@ class HeatPumpExport:
      self._input_data["a10"] = a_coeff[9]
      self._input_data["a11"] = a_coeff[10]

-  def _get_user_out_put(self):
+  def _get_user_out_put(self) -> Union[Dict, None]:
    """
    Extracts monthly electricity demand and fossil fuel consumption
    from output files generated by insel
-    :return:
+    :return: Dict for json output
    """

-    electricity_df = pd.read_csv(self._input_data['fileOut8'].strip("'")).iloc[:, 2]
-    fossil_df = pd.read_csv(self._input_data['fileOut4'].strip("'")).iloc[:, 2]
+    monthly_electricity_df = pd.read_csv(self._input_data['fileOut8'].strip("'")).iloc[:, 2]
+    monthly_fossil_df = pd.read_csv(self._input_data['fileOut4'].strip("'")).iloc[:, 2]

-    data = [electricity_df, fossil_df]
+    if self._output_path is None:
+      return {
+        'hourly_electricity_demand': pd.read_csv(self._input_data['fileOut10'].strip("'")).iloc[:, 5].tolist(),
+        'monthly_electricity_demand': monthly_electricity_df.tolist(),
+        'daily_electricity_demand': pd.read_csv(self._input_data['fileOut6'].strip("'")).iloc[:, 2].tolist(),
+        'daily_fossil_consumption': pd.read_csv(self._input_data['fileOut9'].strip("'")).iloc[:, 2].tolist(),
+        'monthly_fossil_consumption': monthly_fossil_df.tolist()
+      }
+
+    data = [monthly_electricity_df, monthly_fossil_df]
    df = pd.concat(data, axis=1)
    df = pd.concat([df, df.agg(['sum'])])
    s = pd.Series(["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec", "Total"])
    df = df.set_index([s])
    df.to_csv(self._output_path)
+
+
--- a/exports/energy_systems/water_to_water_hp_export.py
+++ b/exports/energy_systems/water_to_water_hp_export.py
@ -6,7 +6,7 @@ Copyright © 2022 Concordia CERC group
 Project Coder Peter Yefi peteryefi@gmail.com
 """
 from exports.energy_systems.heat_pump_export import HeatPumpExport
-from typing import List, Tuple, Union
+from typing import List, Dict, Union


 class WaterToWaterHPExport(HeatPumpExport):
@ -15,17 +15,19 @@ class WaterToWaterHPExport(HeatPumpExport):
  after executing insel
  """

-  def __init__(self, base_path, city, output_path, sim_type):
+  def __init__(self, base_path, city, output_path, sim_type, demand_path):
    """
    :param base_path: path to energy system files
    :param city: the city object
    :param output_path: the file to hold insel simulation results
    :param sim_type: the simulation type to run: 1 for series, 0 for parallel
+    :param demand_path: path to hourly energy demand file
    """
    tmp_file = 'heat_pumps/w2w_series.txt' if sim_type == 0 else 'heat_pumps/w2w_parallel.txt'
    template_path = (base_path / tmp_file)
    water_temp = (base_path / 'heat_pumps/wt_hourly3.txt')
-    super().__init__(base_path, city, output_path, template_path, water_temp)
+    super().__init__(base_path=base_path, city=city, output_path=output_path, template=template_path,
+                     demand_path=demand_path, water_temp=water_temp)

  def _extract_model_coff(self, hp_model: str) -> Union[List, None]:
    """
@ -39,7 +41,7 @@ class WaterToWaterHPExport(HeatPumpExport):
        return energy_system.water_to_water_hp.power_demand_coff
    return None

-  def execute_insel(self, user_input, hp_model):
+  def execute_insel(self, user_input, hp_model) -> Union[Dict, None]:
    """
    Runs insel and produces output files
    Runs insel and write the necessary files
@ -50,4 +52,4 @@ class WaterToWaterHPExport(HeatPumpExport):
    :return:
    """
    pow_demand_coeff = self._extract_model_coff(hp_model)
-    super(WaterToWaterHPExport, self)._run_insel(user_input, pow_demand_coeff, 'w2w.insel')
+    return super(WaterToWaterHPExport, self)._run_insel(user_input, pow_demand_coeff, 'w2w.insel')
--- a/exports/energy_systems_factory.py
+++ b/exports/energy_systems_factory.py
@ -16,7 +16,8 @@ class EnergySystemsExportFactory:
  Exports factory class for energy systems
  """

-  def __init__(self, city, user_input, hp_model, output_path, sim_type=0, data_type='heat', base_path=None):
+  def __init__(self, city, user_input, hp_model, output_path, sim_type=0, data_type='heat', base_path=None,
+               demand_path=None):
    """

    :param city: the city object
@ -26,7 +27,9 @@ class EnergySystemsExportFactory:
    :param sim_type: the simulation type, 0 for series 1 for parallel
    :param data_type: indicates whether cooling or heating data is used
    :param base_path: the data directory of energy systems
+    :param demand_path: path to hourly energy dempand file
    """
+
    self._city = city
    if base_path is None:
      base_path = Path(Path(__file__).parent.parent / 'data/energy_systems')
@ -36,6 +39,7 @@ class EnergySystemsExportFactory:
    self._data_type = data_type
    self._output_path = output_path
    self._sim_type = sim_type
+    self._demand_path = demand_path

  def _export_heat_pump(self, source):
    """
@ -44,10 +48,10 @@ class EnergySystemsExportFactory:
    :return: None
    """
    if source == 'air':
-      AirSourceHPExport(self._base_path, self._city, self._output_path, self._sim_type)\
+      return AirSourceHPExport(self._base_path, self._city, self._output_path, self._sim_type, self._demand_path)\
        .execute_insel(self._user_input, self._hp_model, self._data_type)
    elif source == 'water':
-      WaterToWaterHPExport(self._base_path, self._city, self._output_path, self._sim_type)\
+      return WaterToWaterHPExport(self._base_path, self._city, self._output_path, self._sim_type, self._demand_path)\
        .execute_insel(self._user_input, self._hp_model)

  def export(self, source='air'):
--- a/exports/user_factory.py
+++ b/exports/user_factory.py
@ -0,0 +1,31 @@
+"""
+User performs user related crud operations
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project CoderPeter Yefi peteryefi@gmail.com
+"""
+from persistence import UserRepo
+
+
+class UserFactory:
+  """
+  UserFactory class
+  """
+
+  def __init__(self, db_name, app_env, dotenv_path):
+    self._user_repo = UserRepo(db_name=db_name, app_env=app_env, dotenv_path=dotenv_path)
+
+  def login_user(self, email: str, password: str):
+    """
+    Retrieve a single city from postgres
+    :param email: the email of the user
+    :param password: the password of the user
+    """
+    return self._user_repo.get_user_by_email_and_password(email, password)
+
+  def get_user_by_email(self, email):
+    """
+    Retrieve a single user
+    :param email: the email of the user to get
+    """
+    return self._user_repo.get_by_email(email)
--- a/helpers/auth.py
+++ b/helpers/auth.py
@ -0,0 +1,43 @@
+import bcrypt
+import re
+
+
+class Auth(object):
+
+  @staticmethod
+  def validate_password(password: str) -> bool:
+    """
+    Validates a password
+    :param password: the password to validate
+    :return:
+    """
+    pattern = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\d@$!#%*?&]{6,20}$"
+    pattern = re.compile(pattern)
+    if not re.search(pattern, password):
+      raise ValueError("Password must be between 6 to 20 characters and must have at least a number, an uppercase "
+                       "letter, a lowercase letter, and a special character")
+    return True
+
+  @staticmethod
+  def hash_password(password: str) -> str:
+    """
+    Hashes a password
+    :param password: the password to be hashed
+    :return:
+    """
+    return bcrypt.hashpw(password.encode('utf-8'), bcrypt.gensalt(14)).decode('utf-8')
+
+  @staticmethod
+  def check_password(password: str, hashed_password) -> bool:
+    """
+    Hashes a password
+    :param password: the password to be checked
+    :param hashed_password: the hashed password
+    :return:
+    """
+    return bcrypt.checkpw(password.encode('utf-8'), hashed_password.encode('utf-8'))
+
+
+
+
+
--- a/hub_logger/init.py
+++ b/hub_logger/init.py
@ -0,0 +1,6 @@
+import logging as logger
+from pathlib import Path
+
+log_file = (Path(__file__).parent.parent / 'logs/hub.log').resolve()
+logger.basicConfig(filename=log_file, format="%(asctime)s:%(levelname)s:{%(pathname)s:%(funcName)s:%(lineno)d} "
+                                             "- %(message)s", level=logger.DEBUG)
--- a/imports/init.py
+++ b/imports/init.py
--- a/imports/db_factory.py
+++ b/imports/db_factory.py
@ -0,0 +1,58 @@
+"""
+DBFactory performs database create, delete and update operations
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project CoderPeter Yefi peteryefi@gmail.com
+"""
+from persistence import CityRepo
+from persistence import HeatPumpSimulationRepo
+from typing import Dict
+
+
+class DBFactory:
+  """
+  DBFactory class
+  """
+
+  def __init__(self, city, db_name, dotenv_path, app_env):
+    self._city = city
+    self._city_repo = CityRepo(db_name=db_name, dotenv_path=dotenv_path, app_env=app_env)
+    self._hp_simulation_repo = HeatPumpSimulationRepo(db_name=db_name, dotenv_path=dotenv_path, app_env=app_env)
+
+  def persist_city(self):
+    """
+    Persist city into postgres database
+    """
+    return self._city_repo.insert(self._city)
+
+  def update_city(self, city_id, city):
+    """
+   Update an existing city in postgres database
+   :param city_id: the id of the city to update
+   :param city: the updated city object
+    """
+    return self._city_repo.update(city_id, city)
+
+  def delete_city(self, city_id):
+    """
+    Deletes a single city from postgres
+    :param city_id: the id of the city to get
+    """
+    self._city_repo.delete_city(city_id)
+
+  def persist_hp_simulation(self, hp_simulation_data: Dict, city_id: int):
+    """
+    Persist heat pump simulation results
+    :param hp_simulation_data: the simulation results
+    :param city_id: the city object used in running the simulation
+    :return: HeatPumpSimulation object
+    """
+    return self._hp_simulation_repo.insert(hp_simulation_data, city_id)
+
+  def delete_hp_simulation(self, hp_sim_id):
+    """
+    Deletes a single heat pump simulation from postgres
+    :param hp_sim_id: the id of the heat pump simulation to get
+    """
+    self._hp_simulation_repo.delete_hp_simulation(hp_sim_id)
+
--- a/imports/user_factory.py
+++ b/imports/user_factory.py
@ -0,0 +1,45 @@
+"""
+User performs user-related crud operations
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project CoderPeter Yefi peteryefi@gmail.com
+"""
+from persistence import UserRepo
+from persistence import UserRoles
+
+
+class UserFactory:
+  """
+  UserFactory class
+  """
+
+  def __init__(self, db_name, app_env, dotenv_path):
+    self._user_repo = UserRepo(db_name=db_name, app_env=app_env, dotenv_path=dotenv_path)
+
+  def create_user(self, name: str, email: str, password: str, role: UserRoles):
+    """
+    Creates a new user
+    :param name: the name of the user
+    :param email: the email of the user
+    :param password: the password of the user
+    :param role: the role of the user
+    """
+    return self._user_repo.insert(name, email, password, role)
+
+  def update_user(self, user_id: int, name: str, email: str, password: str, role: UserRoles):
+    """
+    Creates a new user
+    :param user_id: the id of the user
+    :param name: the name of the user
+    :param email: the email of the user
+    :param password: the password of the user
+    :param role: the role of the user
+    """
+    return self._user_repo.update(user_id, name, email, password, role)
+
+  def delete_user(self, user_id):
+    """
+    Retrieve a single user
+    :param user_id: the id of the user to delete
+    """
+    return self._user_repo.delete_user(user_id)
--- a/install_postgresql_linux.sh
+++ b/install_postgresql_linux.sh
@ -0,0 +1,6 @@
+#!/bin/sh
+
+sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list'
+wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
+sudo apt-get update
+sudo apt-get install postgresql
--- a/persistence/README.md
+++ b/persistence/README.md
@ -0,0 +1,50 @@
+## Database Persistence ##
+The persistence package includes classes to store different class objects in a Postgres database.
+
+### models ###
+This defines models for all class objects that we want to persist. It is used for Object Relation Mapping (ORM)
+of the class objects to database table columns
+
+### repositories ###
+This defines repository classes that contain CRUD methods for database operations. The constructor of all repositories requires
+The database name to connect to and the application environment (PROD or TEST). Tests use a different database
+from the production environment, which is why this is necessary. An example is shown below
+```python
+from persistence import CityRepo
+# instantiate city repo for hub production database
+city_repo = CityRepo(db_name='hub', app_env='PROD')
+```
+All database operations are conducted with the production database (*PROD*) named *hub* in the example above
+
+### config_db ##
+This Python file is a configuration class that contains variables that map to configuration parameters in a .env file. 
+It also contains a method ``def conn_string()`` which returns the connection string to a Postgres database.
+
+### Base ##
+This class has a constructor that establishes a database connection and returns a reference for database-related CRUD operations.
+
+### Database Configuration Parameter ###
+A .env file (or environment variables) with configuration parameters described below are needed to establish a database connection:
+```
+# production database credentials
+PROD_DB_USER=postgres-database-user
+PROD_DB_PASSWORD=postgres-database-password
+PROD_DB_HOST=database-host
+PROD_DB_PORT=database-port
+
+# test database credentials
+TEST_DB_USER=postgres-database-user
+TEST_DB_PASSWORD=postgres-database-password
+TEST_DB_HOST=database-host
+TEST_DB_PORT=database-port
+```
+
+### Database Related Unit Test
+Unit tests that involve database operations require a Postgres database to be set up.
+The tests connect to the database server using the default postgres user (*postgres*). 
+NB: You can provide any credentials for the test to connect to postgres, just make sure
+the credentials are set in your .env file as explained above in *Database Configuration Parameters* section
+
+When the tests are run, a **test_db** database is created and then the required tables for
+the test. Before the tests run, the *test_db* is deleted to ensure that each test starts
+on a clean slate
--- a/persistence/init.py
+++ b/persistence/init.py
@ -0,0 +1,6 @@
+from .base_repo import BaseRepo
+from .repositories.city_repo import CityRepo
+from .repositories.heat_pump_simulation_repo import HeatPumpSimulationRepo
+from .db_setup import DBSetup
+from .repositories.user_repo import UserRepo
+from .models.user import UserRoles
--- a/persistence/base_repo.py
+++ b/persistence/base_repo.py
@ -0,0 +1,27 @@
+"""
+Base repository class to establish db connection
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+
+from persistence.db_config import BaseConfiguration
+from sqlalchemy import create_engine
+from sqlalchemy.orm import Session
+
+
+class BaseRepo:
+
+  def __init__(self, db_name, dotenv_path: str, app_env='TEST'):
+    try:
+      self.config = BaseConfiguration(db_name, dotenv_path, app_env)
+      self.engine = create_engine(self.config.conn_string())
+      self.session = Session(self.engine)
+    except ValueError as err:
+      print(f'Missing value for credentials: {err}')
+
+
+
+
+
+
--- a/persistence/db_config.py
+++ b/persistence/db_config.py
@ -0,0 +1,49 @@
+"""
+Persistence (Postgresql) configuration
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+
+import os
+from dotenv import load_dotenv
+from sqlalchemy.ext.declarative import declarative_base
+from hub_logger import logger
+
+Base = declarative_base()
+
+
+class BaseConfiguration(object):
+  """
+    Base configuration class to hold common persistence configuration
+    """
+
+  def __init__(self, db_name: str, dotenv_path: str, app_env='TEST'):
+    """
+      :param db_name: database name
+      :param app_env: application environment, test or production
+      :param dotenv_path: the absolute path to dotenv file
+      """
+    try:
+      # load environmental variables
+      load_dotenv(dotenv_path=dotenv_path)
+      self._db_name = db_name
+      self._db_host = os.getenv(f'{app_env}_DB_HOST')
+      self._db_user = os.getenv(f'{app_env}_DB_USER')
+      self._db_pass = os.getenv(f'{app_env}_DB_PASSWORD')
+      self._db_port = os.getenv(f'{app_env}_DB_PORT')
+      self.hub_token = os.getenv('HUB_TOKEN')
+    except KeyError as err:
+      logger.error(f'Error with credentials: {err}')
+
+  def conn_string(self):
+    """
+      Returns a connection string postgresql
+      :return: connection string
+      """
+    if self._db_pass:
+      return f'postgresql://{self._db_user}:{self._db_pass}@{self._db_host}:{self._db_port}/{self._db_name}'
+    return f'postgresql://{self._db_user}@{self._db_host}:{self._db_port}/{self._db_name}'
+
+  def get_db_user(self):
+    return self._db_user
--- a/persistence/db_setup.py
+++ b/persistence/db_setup.py
@ -0,0 +1,37 @@
+from persistence.models import City
+from persistence import BaseRepo
+from persistence.models import HeatPumpSimulation
+from persistence.models import User
+from persistence.repositories import UserRepo
+from persistence.models import UserRoles
+from hub_logger import logger
+
+
+class DBSetup:
+
+  def __init__(self, db_name, app_env, dotenv_path):
+    """
+    Creates database tables and a default admin user
+    :param db_name:
+    :param app_env:
+    :param dotenv_path:
+    """
+    repo = BaseRepo(db_name=db_name, app_env=app_env, dotenv_path=dotenv_path)
+    City.__table__.create(bind=repo.engine, checkfirst=True)
+    HeatPumpSimulation.__table__.create(bind=repo.engine, checkfirst=True)
+    User.__table__.create(bind=repo.engine, checkfirst=True)
+    self._user_repo = UserRepo(db_name=db_name, app_env=app_env, dotenv_path=dotenv_path)
+    self._create_admin_user(self._user_repo)
+
+  def _create_admin_user(self, user_repo):
+    email = 'admin@hub.com'
+    password = 'HubAdmin#!98'
+    print('Creating default admin user...')
+    user = user_repo.insert('Administrator', email, password, UserRoles.Admin)
+    if type(user) is dict:
+      print(user)
+      logger.info(user)
+    else:
+      print(f'Created Admin user with email: {email}, password: {password} and role: {UserRoles.Admin}')
+      logger.info(f'Created Admin user with email: {email}, password: {password} and role: {UserRoles.Admin}')
+      print('Remember to change the admin default password and email address with the UserFactory')
--- a/persistence/models/init.py
+++ b/persistence/models/init.py
@ -0,0 +1,5 @@
+from .city import City
+from .heat_pump_simulation import HeatPumpSimulation
+from .heat_pump_simulation import SimulationTypes
+from .heat_pump_simulation import HeatPumpTypes
+from .user import User, UserRoles
--- a/persistence/models/city.py
+++ b/persistence/models/city.py
@ -0,0 +1,42 @@
+"""
+Model representation of a City
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+
+from sqlalchemy import Column, Integer, String, Sequence
+from sqlalchemy import DateTime, PickleType, Float
+from persistence.db_config import Base
+from sqlalchemy.dialects.postgresql import JSONB
+import datetime
+
+
+class City(Base):
+  """A model representation of a city
+  """
+  __tablename__ = "city"
+  id = Column(Integer, Sequence('city_id_seq'), primary_key=True)
+  city = Column(PickleType, nullable=False)
+  name = Column(String, nullable=False)
+  srs_name = Column(String, nullable=False)
+  climate_reference_city = Column(String, nullable=True)
+  time_zone = Column(String, nullable=True)
+  country_code = Column(String, nullable=False)
+  latitude = Column(Float)
+  longitude = Column(Float)
+  lower_corner = Column(JSONB, nullable=False)
+  upper_corner = Column(JSONB, nullable=False)
+  hub_release = Column(String, nullable=False)
+  city_version = Column(Integer, nullable=False)
+  created = Column(DateTime, default=datetime.datetime.utcnow)
+
+  def __init__(self, city, name, srs_name, country_code, l_corner, u_corner):
+    self.city = city
+    self.name = name
+    self.srs_name = srs_name
+    self.country_code = country_code
+    self.lower_corner = l_corner.tolist()
+    self.upper_corner = u_corner.tolist()
+
+
--- a/persistence/models/heat_pump_simulation.py
+++ b/persistence/models/heat_pump_simulation.py
@ -0,0 +1,86 @@
+"""
+Model representation of the results of heat pump simulation
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+
+from sqlalchemy import Column, Integer, String, Sequence
+from sqlalchemy import Enum, ForeignKey, Float, DateTime
+from sqlalchemy.dialects.postgresql import JSONB
+from persistence.db_config import Base
+import enum
+import datetime
+
+
+class SimulationTypes(enum.Enum):
+  Parallel = 'PARALLEL'
+  Series = 'SERIES'
+
+
+class HeatPumpTypes(enum.Enum):
+  Air = 'Air Source'
+  Water = 'Water to Water'
+
+
+class HeatPumpSimulation(Base):
+  """A model representation of a building
+
+        Attributes:
+            city_id,  A reference to the city which was used to run this simulation.
+            hourly_electricity_demand, A JSON object that has hours and their electricity demand
+            daily_electricity_demand, A JSON object that has days and their electricity demand
+            monthly_electricity_demand, A JSON object that has months and their electricity demand
+            daily_fossil_fuel_consumption, A JSON object that has days and fossil fuel consumption
+            monthly_fossil_fuel_consumption, A JSON object that has months and fossil fuel consumption
+            heat_pump_type, Water or air heat pump
+            simulation_type, The type of heat pump simulation (parallel or series)
+            heat_pump_model, The model of the heat pump (either water to water or air source)
+            start year, HP simulation start year
+            end year, HP simulation end year
+            max_hp_energy_input, Maximum heat pump energy input
+            max_demand_storage_hour, Hours of storage at maximum demand
+            building_supply_temp, building supply temperature
+            temp_difference, Difference in HP and building supply temperatures
+            fuel_lhv, The lower heating value of fuel
+            fuel_price, The price of fuel
+            fuel_efficiency, the efficiency of fuel
+            fuel_density, the density of fuel
+            hp_supply_temp, supply temperature of heat pump
+
+
+    """
+  __tablename__ = "heat_pump_simulation"
+  id = Column(Integer, Sequence('hp_simulation_id_seq'), primary_key=True)
+  city_id = Column(Integer, ForeignKey('city.id'), nullable=False)
+  daily_electricity_demand = Column(JSONB, nullable=False)
+  hourly_electricity_demand = Column(JSONB, nullable=False)
+  daily_fossil_fuel_consumption = Column(JSONB, nullable=False)
+  monthly_fossil_fuel_consumption = Column(JSONB, nullable=False)
+  monthly_electricity_demand = Column(JSONB, nullable=False)
+  heat_pump_type = Column(Enum(HeatPumpTypes), nullable=False)
+  simulation_type = Column(Enum(SimulationTypes), nullable=False)
+  heat_pump_model = Column(String, nullable=False)
+  start_year = Column(Integer, nullable=False)
+  end_year = Column(Integer, nullable=False)
+  max_hp_energy_input = Column(Float, nullable=False)
+  max_demand_storage_hour = Column(Float, nullable=False)
+  building_supply_temp = Column(Float, nullable=False)
+  temp_difference = Column(Float, nullable=False)
+  fuel_lhv = Column(Float, nullable=False)
+  fuel_price = Column(Float, nullable=False)
+  fuel_efficiency = Column(Float, nullable=False)
+  fuel_density = Column(Float, nullable=False)
+  hp_supply_temp = Column(Float, nullable=False)
+  created = Column(DateTime, default=datetime.datetime.utcnow)
+
+  def __init__(self, city_id, hourly_elec_demand, daily_elec_demand, monthly_elec_demand, daily_fossil, monthly_fossil):
+    self.city_id = city_id
+    self.hourly_electricity_demand = hourly_elec_demand
+    self.daily_electricity_demand = daily_elec_demand
+    self.monthly_electricity_demand = monthly_elec_demand
+    self.daily_fossil_fuel_consumption = daily_fossil
+    self.monthly_fossil_fuel_consumption = monthly_fossil
+
+
+
--- a/persistence/models/user.py
+++ b/persistence/models/user.py
@ -0,0 +1,45 @@
+"""
+Model representation of a User
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+
+from sqlalchemy import Column, Integer, String, Sequence
+from sqlalchemy import DateTime, Enum
+from persistence.db_config import Base
+import datetime
+from sqlalchemy.orm import validates
+import re
+import enum
+
+
+class UserRoles(enum.Enum):
+  Admin = 'ADMIN'
+  HubReader = 'HUB_READER'
+
+
+class User(Base):
+  """A model representation of a city
+  """
+  __tablename__ = "user"
+  id = Column(Integer, Sequence('user_id_seq'), primary_key=True)
+  name = Column(String, nullable=False)
+  email = Column(String, nullable=False, unique=True)
+  password = Column(String, nullable=False)
+  role = Column(Enum(UserRoles), nullable=False, default=UserRoles.HubReader)
+  created = Column(DateTime, default=datetime.datetime.utcnow)
+  updated = Column(DateTime, default=datetime.datetime.utcnow)
+
+  @validates("email")
+  def validate_email(self, key, address):
+    pattern = r'\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b'
+    if not re.match(pattern, address):
+      raise ValueError("failed simple email validation")
+    return address
+
+  def __init__(self, name, email, password, role):
+    self.name = name
+    self.email = email
+    self.password = password
+    self.role = role
--- a/persistence/repositories/init.py
+++ b/persistence/repositories/init.py
@ -0,0 +1 @@
+from .user_repo import UserRepo
--- a/persistence/repositories/city_repo.py
+++ b/persistence/repositories/city_repo.py
@ -0,0 +1,138 @@
+"""
+City repository with database CRUD operations
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+
+from city_model_structure.city import City
+from persistence import BaseRepo
+from sqlalchemy.exc import SQLAlchemyError
+from sqlalchemy import select
+from persistence.models import City as DBCity
+import pickle
+import requests
+from urllib3.exceptions import HTTPError
+from typing import Union, Dict
+from hub_logger import logger
+
+
+class CityRepo(BaseRepo):
+  _instance = None
+
+  def __init__(self, db_name: str, dotenv_path: str, app_env: str):
+    super().__init__(db_name, dotenv_path, app_env)
+
+  def __new__(cls, db_name, dotenv_path, app_env):
+    """
+    Implemented for a singleton pattern
+    """
+    if cls._instance is None:
+      cls._instance = super(CityRepo, cls).__new__(cls)
+    return cls._instance
+
+  def insert(self, city: City) -> Union[City, Dict]:
+    db_city = DBCity(pickle.dumps(city), city.name, city.srs_name, city.country_code, city.lower_corner,
+                     city.upper_corner)
+    db_city.climate_reference_city = city.climate_reference_city
+    db_city.longitude = city.longitude
+    db_city.latitude = city.latitude
+    db_city.time_zone = city.time_zone
+
+    try:
+      # Retrieve hub project latest release
+      response = requests.get("https://rs-loy-gitlab.concordia.ca/api/v4/projects/2/repository/branches/master",
+                              headers={"PRIVATE-TOKEN": self.config.hub_token})
+      recent_commit = response.json()["commit"]["id"]
+      logger.info(f'Current commit of hub is {recent_commit}')
+      exiting_city = self._get_by_hub_version(recent_commit, city.name)
+
+      # Do not persist the same city for the same version of Hub
+      if exiting_city is None:
+        db_city.hub_release = recent_commit
+        cities = self.get_by_name(city.name)
+        # update version for the same city but different hub versions
+
+        if len(cities) == 0:
+          db_city.city_version = 0
+        else:
+          db_city.city_version = cities[-1].city_version + 1
+
+        # Persist city
+        self.session.add(db_city)
+        self.session.flush()
+        self.session.commit()
+        return db_city
+      else:
+        return {'message': f'Same version of {city.name} exist'}
+    except SQLAlchemyError as err:
+      logger.error(f'Error while adding city: {err}')
+    except HTTPError as err:
+      logger.error(f'Error retrieving Hub latest release: {err}')
+
+  def get_by_id(self, city_id: int) -> DBCity:
+    """
+    Fetch a City based on the id
+    :param city_id: the city id
+    :return: a city
+    """
+    try:
+      return self.session.execute(select(DBCity).where(DBCity.id == city_id)).first()[0]
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching city: {err}')
+
+  def _get_by_hub_version(self, hub_commit: str, city_name: str) -> City:
+    """
+    Fetch a City based on the name and hub project recent commit
+    :param hub_commit: the latest hub commit
+    :param city_name: the name of the city
+    :return: a city
+    """
+    try:
+      return self.session.execute(select(DBCity)
+                                  .where(DBCity.hub_release == hub_commit, DBCity.name == city_name)).first()
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching city: {err}')
+
+  def update(self, city_id: int, city: City):
+    """
+    Updates a city
+    :param city_id: the id of the city to be updated
+    :param city: the city object
+    :return:
+    """
+    try:
+      self.session.query(DBCity).filter(DBCity.id == city_id) \
+        .update({
+        'name': city.name, 'srs_name': city.srs_name, 'country_code': city.country_code, 'longitude': city.longitude,
+        'latitude': city.latitude, 'time_zone': city.time_zone, 'lower_corner': city.lower_corner.tolist(),
+        'upper_corner': city.upper_corner.tolist(), 'climate_reference_city': city.climate_reference_city,
+      })
+
+      self.session.commit()
+    except SQLAlchemyError as err:
+      logger.error(f'Error while updating city: {err}')
+
+  def get_by_name(self, city_name: str) -> [DBCity]:
+    """
+    Fetch city based on the name
+    :param city_name: the name of the building
+    :return: [ModelCity] with the provided name
+    """
+    try:
+      result_set = self.session.execute(select(DBCity).where(DBCity.name == city_name))
+      return [building[0] for building in result_set]
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching city by name: {err}')
+
+  def delete_city(self, city_id: int):
+    """
+    Deletes a City with the id
+    :param city_id: the city id
+    :return: a city
+    """
+    try:
+      self.session.query(DBCity).filter(DBCity.id == city_id).delete()
+      self.session.commit()
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching city: {err}')
--- a/persistence/repositories/heat_pump_simulation_repo.py
+++ b/persistence/repositories/heat_pump_simulation_repo.py
@ -0,0 +1,108 @@
+"""
+Heat pump simulation repository with database CRUD operations
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+
+from persistence import BaseRepo, CityRepo
+from sqlalchemy.exc import SQLAlchemyError
+from sqlalchemy import select
+from persistence.models import HeatPumpSimulation
+from typing import Union, Dict
+from hub_logger import logger
+
+
+class HeatPumpSimulationRepo(BaseRepo):
+  _instance = None
+
+  def __init__(self, db_name, dotenv_path, app_env):
+    super().__init__(db_name, dotenv_path, app_env)
+    self._city_repo = CityRepo(db_name, dotenv_path, app_env)
+
+  def __new__(cls, db_name, dotenv_path, app_env):
+    """
+    Implemented for a singleton pattern
+    """
+    if cls._instance is None:
+      cls._instance = super(HeatPumpSimulationRepo, cls).__new__(cls)
+    return cls._instance
+
+  def insert(self, hp_sim_data: Dict, city_id: int) -> Union[HeatPumpSimulation, Dict]:
+    """
+    Inserts the results of heat pump simulation
+    :param hp_sim_data: dictionary with heatpump the simulation inputs and output
+    :param city_id: the city that was used in running the simulation
+    :return: HeatPumpSimulation
+    """
+
+    city = self._city_repo.get_by_id(city_id)
+    if city is None:
+      return {'message': 'city not found in database'}
+
+    try:
+      hp_simulation = HeatPumpSimulation(city_id, hp_sim_data["HourlyElectricityDemand"],
+                                         hp_sim_data["DailyElectricityDemand"], hp_sim_data["MonthlyElectricityDemand"],
+                                         hp_sim_data["DailyFossilFuelConsumption"],
+                                         hp_sim_data["MonthlyFossilFuelConsumption"])
+      hp_simulation.city_id = city_id
+      hp_simulation.end_year = hp_sim_data["EndYear"]
+      hp_simulation.start_year = hp_sim_data["StartYear"]
+      hp_simulation.max_demand_storage_hour = hp_sim_data["HoursOfStorageAtMaxDemand"]
+      hp_simulation.max_hp_energy_input = hp_sim_data["MaximumHPEnergyInput"]
+      hp_simulation.building_supply_temp = hp_sim_data["BuildingSuppTemp"]
+      hp_simulation.temp_difference = hp_sim_data["TemperatureDifference"]
+      hp_simulation.fuel_lhv = hp_sim_data["FuelLHV"]
+      hp_simulation.fuel_price = hp_sim_data["FuelPrice"]
+      hp_simulation.fuel_efficiency = hp_sim_data["FuelEF"]
+      hp_simulation.fuel_density = hp_sim_data["FuelDensity"]
+      hp_simulation.hp_supply_temp = hp_sim_data["HPSupTemp"]
+      hp_simulation.simulation_type = hp_sim_data["SimulationType"]
+      hp_simulation.heat_pump_model = hp_sim_data["HeatPumpModel"]
+      hp_simulation.heat_pump_type = hp_sim_data["HeatPumpType"]
+
+      # Persist heat pump simulation data
+      self.session.add(hp_simulation)
+      self.session.flush()
+      self.session.commit()
+      return hp_simulation
+    except SQLAlchemyError as err:
+      logger.error(f'Error while saving heat pump simulation data: {err}')
+    except KeyError as err:
+      logger.error(f'A required field is missing in your heat pump simulation dictionary: {err}')
+
+  def get_by_id(self, hp_simulation_id: int) -> HeatPumpSimulation:
+    """
+    Fetches heat pump simulation data
+    :param hp_simulation_id: the city id
+    :return: a HeatPumpSimulation
+    """
+    try:
+      return self.session.execute(select(HeatPumpSimulation).where(HeatPumpSimulation.id == hp_simulation_id)).first()[
+        0]
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching city: {err}')
+
+  def get_by_city(self, city_id: int) -> [HeatPumpSimulation]:
+    """
+    Fetch heat pump simulation results by city
+    :param city_id: the name of the building
+    :return: [HeatPumpSimulation] with the provided name
+    """
+    try:
+      result_set = self.session.execute(select(HeatPumpSimulation).where(HeatPumpSimulation.city_id == city_id))
+      return [sim_data[0] for sim_data in result_set]
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching city by name: {err}')
+
+  def delete_hp_simulation(self, hp_simulation_id: int):
+    """
+    Deletes a heat pump simulation results
+    :param hp_simulation_id: the heat pump simulation results id
+    :return:
+    """
+    try:
+      self.session.query(HeatPumpSimulation).filter(HeatPumpSimulation.id == hp_simulation_id).delete()
+      self.session.commit()
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching city: {err}')
--- a/persistence/repositories/user_repo.py
+++ b/persistence/repositories/user_repo.py
@ -0,0 +1,102 @@
+"""
+City repository with database CRUD operations
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+
+from persistence import BaseRepo
+from sqlalchemy.exc import SQLAlchemyError
+from sqlalchemy import select
+from persistence.models import User
+from persistence.models import UserRoles
+from helpers.auth import Auth
+from typing import Union, Dict
+from hub_logger import logger
+
+
+class UserRepo(BaseRepo):
+  _instance = None
+
+  def __init__(self, db_name: str, dotenv_path: str, app_env: str):
+    super().__init__(db_name, dotenv_path, app_env)
+
+  def __new__(cls, db_name, dotenv_path, app_env):
+    """
+    Implemented for a singleton pattern
+    """
+    if cls._instance is None:
+      cls._instance = super(UserRepo, cls).__new__(cls)
+    return cls._instance
+
+  def insert(self, name: str, email: str, password: str, role: UserRoles) -> Union[User, Dict]:
+    user = self.get_by_email(email)
+    if user is None:
+      try:
+        if Auth.validate_password(password):
+          user = User(name=name, email=email, password=Auth.hash_password(password), role=role)
+          self.session.add(user)
+          self.session.flush()
+          self.session.commit()
+          return user
+      except SQLAlchemyError as err:
+        logger.error(f'An error occured while creating user: {err}')
+    else:
+      return {'message': f'user with {email} email already exists'}
+
+  def update(self, user_id: int, name: str, email: str, password: str, role: UserRoles):
+    """
+    Updates a user
+    :param user_id: the id of the user to be updated
+    :param name: the name of the user
+    :param email: the email of the user
+    :param password: the password of the user
+    :param role: the role of the user
+    :return:
+    """
+    try:
+      if Auth.validate_password(password):
+        self.session.query(User).filter(User.id == user_id) \
+          .update({'name': name, 'email': email, 'password': Auth.hash_password(password), 'role': role})
+      self.session.commit()
+    except SQLAlchemyError as err:
+      logger.error(f'Error while updating user: {err}')
+
+  def get_by_email(self, email: str) -> [User]:
+    """
+    Fetch user based on the email address
+    :param email: the email of the user
+    :return: [User] with the provided email
+    """
+    try:
+      return self.session.execute(select(User).where(User.email == email)).first()
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching user by email: {err}')
+
+  def delete_user(self, user_id: int):
+    """
+    Deletes a user with the id
+    :param user_id: the user id
+    :return: None
+    """
+    try:
+      self.session.query(User).filter(User.id == user_id).delete()
+      self.session.commit()
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching user: {err}')
+
+  def get_user_by_email_and_password(self, email: str, password: str) -> [User]:
+    """
+    Fetch user based on the email and password
+    :param email: the email of the user
+    :param password: the password of the user
+    :return: [User] with the provided email and password
+    """
+    try:
+      user = self.session.execute(select(User).where(User.email == email)).first()
+      if user:
+        if Auth.check_password(password, user[0].password):
+          return user
+      return {'message': 'user not found'}
+    except SQLAlchemyError as err:
+      logger.error(f'Error while fetching user by email: {err}')
--- a/requirements.txt
+++ b/requirements.txt
@ -16,6 +16,9 @@ rhino3dm==7.7.0
 scipy
 PyYAML
 pyecore==0.12.2
+python-dotenv
+SQLAlchemy
+bcrypt==4.0.1
 shapely
 geopandas
-triangle
+triangle
--- a/unittests/test_db_factory.py
+++ b/unittests/test_db_factory.py
@ -0,0 +1,90 @@
+"""
+Test EnergySystemsFactory and various heatpump models
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+from unittest import TestCase
+from imports.geometry_factory import GeometryFactory
+from imports.db_factory import DBFactory
+from exports.db_factory import DBFactory as ExportDBFactory
+from persistence.base_repo import BaseRepo
+from sqlalchemy import create_engine
+from persistence.models import City
+from pickle import loads
+from sqlalchemy.exc import ProgrammingError
+
+
+class TestDBFactory(TestCase):
+  """
+  TestDBFactory
+  """
+
+  @classmethod
+  def setUpClass(cls) -> None:
+    """
+    Test setup
+    :return: None
+    """
+    # Create test database
+    repo = BaseRepo(db_name='test_db', app_env='TEST', dotenv_path='../.env')
+    eng = create_engine(f'postgresql://{repo.config.get_db_user()}@/{repo.config.get_db_user()}')
+
+    try:
+      # delete test database if it exists
+      conn = eng.connect()
+      conn.execute('commit')
+      conn.execute('DROP DATABASE test_db')
+      conn.close()
+    except ProgrammingError as err:
+      print(f'Database does not exist. Nothing to delete')
+
+    cnn = eng.connect()
+    cnn.execute('commit')
+    cnn.execute("CREATE DATABASE test_db")
+    cnn.close()
+
+    City.__table__.create(bind=repo.engine, checkfirst=True)
+
+    city_file = "../unittests/tests_data/C40_Final.gml"
+    cls.city = GeometryFactory('citygml', city_file).city
+    cls._db_factory = DBFactory(city=cls.city, db_name='test_db', app_env='TEST', dotenv_path='../.env')
+    cls._export_db_factory = ExportDBFactory(db_name='test_db', app_env='TEST', dotenv_path='../.env')
+
+  def test_save_city(self):
+    saved_city = self._db_factory.persist_city()
+    self.assertEqual(saved_city.name, 'Montréal')
+    pickled_city = loads(saved_city.city)
+    self.assertEqual(len(pickled_city.buildings), 10)
+    self.assertEqual(pickled_city.buildings[0].floor_area, 1990.9913970530033)
+    self._db_factory.delete_city(saved_city.id)
+
+  def test_save_same_city_with_same_hub_version(self):
+    first_city = self._db_factory.persist_city()
+    second_city = self._db_factory.persist_city()
+    self.assertEqual(second_city['message'], f'Same version of {self.city.name} exist')
+    self.assertEqual(first_city.name, 'Montréal')
+    self.assertEqual(first_city.country_code, 'ca')
+    self._db_factory.delete_city(first_city.id)
+
+  def test_get_city_by_name(self):
+    city = self._db_factory.persist_city()
+    retrieved_city = self._export_db_factory.get_city_by_name(city.name)
+    self.assertEqual(retrieved_city[0].lower_corner[0], 610610.7547462888)
+    self._db_factory.delete_city(city.id)
+
+  def test_get_city_by_id(self):
+    city = self._db_factory.persist_city()
+    retrieved_city = self._export_db_factory.get_city(city.id)
+    self.assertEqual(retrieved_city.upper_corner[0], 610818.6731258357)
+    self._db_factory.delete_city(city.id)
+
+  def test_get_update_city(self):
+    city = self._db_factory.persist_city()
+    self.city.longitude = 1.43589
+    self.city.latitude = -9.38928339
+    self._db_factory.update_city(city.id, self.city)
+    updated_city = self._export_db_factory.get_city(city.id)
+    self.assertEqual(updated_city.longitude, 1.43589)
+    self.assertEqual(updated_city.latitude, -9.38928339)
+    self._db_factory.delete_city(city.id)
--- a/unittests/test_energy_systems_air_source_hp.py
+++ b/unittests/test_energy_systems_air_source_hp.py
@ -12,6 +12,21 @@ from city_model_structure.energy_systems.air_source_hp import AirSourceHP
 from exports.energy_systems_factory import EnergySystemsExportFactory
 import os

+# User defined paramenters
+user_input = {
+  'StartYear': 2020,
+  'EndYear': 2021,
+  'MaximumHPEnergyInput': 8000,
+  'HoursOfStorageAtMaxDemand': 1,
+  'BuildingSuppTemp': 40,
+  'TemperatureDifference': 15,
+  'FuelLHV': 47100,
+  'FuelPrice': 0.12,
+  'FuelEF': 1887,
+  'FuelDensity': 0.717,
+  'HPSupTemp': 60
+}
+

 class TestEnergySystemsFactory(TestCase):
  """
@ -34,27 +49,20 @@ class TestEnergySystemsFactory(TestCase):
    self.assertEqual(self._city.energy_systems[0].air_source_hp.model, '012')
    self.assertEqual(self._city.energy_systems[16].air_source_hp.model, '140')

-  def test_air_source_heat_pump_export(self):
-    # User defined paramenters
-    user_input = {
-      'StartYear': 2020,
-      'EndYear': 2021,
-      'MaximumHPEnergyInput': 8000,
-      'HoursOfStorageAtMaxDemand': 1,
-      'BuildingSuppTemp': 40,
-      'TemperatureDifference': 15,
-      'FuelLHV': 47100,
-      'FuelPrice': 0.12,
-      'FuelEF': 1887,
-      'FuelDensity': 0.717,
-      'HPSupTemp': 60
-    }
-
-    EnergySystemsExportFactory(self._city, user_input, '012', self._output_path).export()
+  def test_air_source_series_heat_pump_export(self):
+    EnergySystemsExportFactory(city=self._city, user_input=user_input, hp_model='012',
+                               output_path=self._output_path).export()
    df = pd.read_csv(self._output_path)
    self.assertEqual(df.shape, (13, 3))
    self.assertEqual(df.iloc[0, 1], 1867715.88)

+  def test_air_source_parallel_heat_pump_export(self):
+    output = EnergySystemsExportFactory(city=self._city, user_input=user_input, hp_model='018',
+                                        output_path=None, sim_type=1).export()
+    self.assertEqual(output["hourly_electricity_demand"][0], 38748.5625)
+    self.assertIsNotNone(output["daily_fossil_consumption"])
+    self.assertEqual(len(output["hourly_electricity_demand"]), 8760)
+
  def tearDown(self) -> None:
    try:
      os.remove(self._output_path)
--- a/unittests/test_energy_systems_water_to_water_hp.py
+++ b/unittests/test_energy_systems_water_to_water_hp.py
@ -13,6 +13,21 @@ import pandas as pd

 import os

+# User defined paramenters
+user_input = {
+  'StartYear': 2020,
+  'EndYear': 2021,
+  'MaximumHPEnergyInput': 8000,
+  'HoursOfStorageAtMaxDemand': 1,
+  'BuildingSuppTemp': 40,
+  'TemperatureDifference': 15,
+  'FuelLHV': 47100,
+  'FuelPrice': 0.12,
+  'FuelEF': 1887,
+  'FuelDensity': 0.717,
+  'HPSupTemp': 60
+}
+

 class TestEnergySystemsFactory(TestCase):
  """
@ -62,11 +77,11 @@ class TestEnergySystemsFactory(TestCase):
      'b11': 10
    }

-    EnergySystemsExportFactory(self._city, user_input, 'ClimateMaster 156 kW', self._output_path).export('water')
+    EnergySystemsExportFactory(city=self._city, user_input=user_input, hp_model='ClimateMaster 256 kW',
+                               output_path=self._output_path, sim_type=1).export('water')
    df = pd.read_csv(self._output_path)
-    print(df.shape)
-    #self.assertEqual(df.shape, (13, 3))
-    #self.assertEqual(df.iloc[0, 1], 3045398.0)
+    self.assertEqual(df.shape, (13, 3))
+    self.assertEqual(df.iloc[0, 1], 1031544.62)

  def tearDown(self) -> None:
    try:
--- a/unittests/test_heat_pump_simulation.py
+++ b/unittests/test_heat_pump_simulation.py
@ -0,0 +1,118 @@
+"""
+Test EnergySystemsFactory and various heatpump models
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2022 Concordia CERC group
+Project Coder Peter Yefi peteryefi@gmail.com
+"""
+from unittest import TestCase
+from imports.geometry_factory import GeometryFactory
+from imports.energy_systems_factory import EnergySystemsFactory
+from exports.energy_systems_factory import EnergySystemsExportFactory
+from imports.db_factory import DBFactory
+from exports.db_factory import DBFactory as ExportDBFactory
+from persistence.base_repo import BaseRepo
+from sqlalchemy import create_engine
+from persistence.models import City
+from persistence.models import SimulationTypes
+from persistence.models import HeatPumpTypes
+from persistence.models import HeatPumpSimulation
+from sqlalchemy.exc import ProgrammingError
+
+# User defined paramenters
+hp_sim_data = {
+  'StartYear': 2020,
+  'EndYear': 2021,
+  'MaximumHPEnergyInput': 8000,
+  'HoursOfStorageAtMaxDemand': 1,
+  'BuildingSuppTemp': 40,
+  'TemperatureDifference': 15,
+  'FuelLHV': 47100,
+  'FuelPrice': 0.12,
+  'FuelEF': 1887,
+  'FuelDensity': 0.717,
+  'HPSupTemp': 60
+}
+
+
+class TestHeatPumpSimulation(TestCase):
+  """
+  Heat pump simulation test cases
+  """
+  @classmethod
+  def setUpClass(cls) -> None:
+    """
+    Test setup
+    :return: None
+    """
+    repo = BaseRepo(db_name='test_db', app_env='TEST', dotenv_path='../.env')
+    eng = create_engine(f'postgresql://{repo.config.get_db_user()}@/{repo.config.get_db_user()}')
+
+    try:
+      conn = eng.connect()
+      conn.execute('commit')
+      conn.execute('DROP DATABASE test_db')
+      conn.close()
+    except ProgrammingError as err:
+      print(f'Database does not exist. Nothing to delete')
+
+    cnn = eng.connect()
+    cnn.execute('commit')
+    cnn.execute("CREATE DATABASE test_db")
+    cnn.close()
+
+    # Create test tables if they do not exit
+    City.__table__.create(bind=repo.engine, checkfirst=True)
+    HeatPumpSimulation.__table__.create(bind=repo.engine, checkfirst=True)
+
+    city_file = "../unittests/tests_data/C40_Final.gml"
+    cls._city = GeometryFactory('citygml', city_file).city
+    EnergySystemsFactory('air source hp', cls._city).enrich()
+
+    cls._db_factory = DBFactory(city=cls._city, db_name='test_db', app_env='TEST', dotenv_path='../.env')
+    cls._export_db_factory = ExportDBFactory(db_name='test_db', app_env='TEST', dotenv_path='../.env')
+
+  def test_heat_pump_simulation_persistence(self):
+    output = EnergySystemsExportFactory(city=self._city, user_input=hp_sim_data, hp_model='018',
+                                        output_path=None, sim_type=1).export()
+    hp_sim_data["HeatPumpModel"] = '018'
+    hp_sim_data["SimulationType"] = SimulationTypes.Parallel
+    hp_sim_data["HeatPumpType"] = HeatPumpTypes.Air
+    hp_sim_data["HourlyElectricityDemand"] = output["hourly_electricity_demand"]
+    hp_sim_data["DailyElectricityDemand"] = output["daily_electricity_demand"]
+    hp_sim_data["MonthlyElectricityDemand"] = output["monthly_electricity_demand"]
+    hp_sim_data["DailyFossilFuelConsumption"] = output["daily_fossil_consumption"]
+    hp_sim_data["MonthlyFossilFuelConsumption"] = output["monthly_fossil_consumption"]
+
+    saved_city = self._db_factory.persist_city()
+    hp_sim = self._db_factory.persist_hp_simulation(hp_sim_data, saved_city.id)
+    self.assertEqual(hp_sim.heat_pump_type, HeatPumpTypes.Air)
+    self.assertEqual(hp_sim.simulation_type, SimulationTypes.Parallel)
+    self.assertEqual(hp_sim.fuel_efficiency, hp_sim_data["FuelEF"])
+    self.assertEqual(hp_sim.monthly_electricity_demand, output["monthly_electricity_demand"])
+    self._db_factory.delete_hp_simulation(hp_sim.id)
+    self._db_factory.delete_city(saved_city.id)
+
+  def test_get_heat_pump_simulation_by_city(self):
+    output = EnergySystemsExportFactory(city=self._city, user_input=hp_sim_data, hp_model='012',
+                                        output_path=None, sim_type=0).export()
+    hp_sim_data["HeatPumpModel"] = '012'
+    hp_sim_data["SimulationType"] = SimulationTypes.Series
+    hp_sim_data["HeatPumpType"] = HeatPumpTypes.Air
+    hp_sim_data["HourlyElectricityDemand"] = output["hourly_electricity_demand"]
+    hp_sim_data["DailyElectricityDemand"] = output["daily_electricity_demand"]
+    hp_sim_data["MonthlyElectricityDemand"] = output["monthly_electricity_demand"]
+    hp_sim_data["DailyFossilFuelConsumption"] = output["daily_fossil_consumption"]
+    hp_sim_data["MonthlyFossilFuelConsumption"] = output["monthly_fossil_consumption"]
+
+    saved_city = self._db_factory.persist_city()
+    self._db_factory.persist_hp_simulation(hp_sim_data, saved_city.id)
+
+    # retrieved saved simulation by city id
+    hp_sim = self._export_db_factory.get_hp_simulation_by_city(saved_city.id)
+    self.assertEqual(hp_sim[0].heat_pump_type, HeatPumpTypes.Air)
+    self.assertEqual(hp_sim[0].simulation_type, SimulationTypes.Series)
+    self.assertEqual(hp_sim[0].fuel_price, hp_sim_data["FuelPrice"])
+    self.assertEqual(hp_sim[0].hourly_electricity_demand, output["hourly_electricity_demand"])
+    self._db_factory.delete_hp_simulation(hp_sim[0].id)
+    self._db_factory.delete_city(saved_city.id)
+