diff --git a/.idea/misc.xml b/.idea/misc.xml
index 55f930c..89e1c60 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -3,7 +3,7 @@
   <component name="ClojureProjectResolveSettings">
     <currentScheme>IDE</currentScheme>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_14" default="false">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_14" default="false" project-jdk-name="Poetry (g2-progetto) (2)" project-jdk-type="Python SDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Backend__Start_dev_server.xml b/.idea/runConfigurations/Backend__Start_dev_server.xml
index 41b9a07..2c2f21c 100644
--- a/.idea/runConfigurations/Backend__Start_dev_server.xml
+++ b/.idea/runConfigurations/Backend__Start_dev_server.xml
@@ -6,7 +6,7 @@
     <envs>
       <env name="PYTHONUNBUFFERED" value="1" />
     </envs>
-    <option name="SDK_HOME" value="" />
+    <option name="SDK_HOME" value="C:\Users\loren\AppData\Local\pypoetry\Cache\virtualenvs\g2-progetto-pFEbXYE_-py3.8\Scripts\python.exe" />
     <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$/code/backend/nest_backend" />
     <option name="IS_MODULE_SDK" value="true" />
     <option name="ADD_CONTENT_ROOTS" value="true" />
diff --git a/code/backend/nest_backend/__main__.py b/code/backend/nest_backend/__main__.py
index 34e35f9..d58ebb5 100644
--- a/code/backend/nest_backend/__main__.py
+++ b/code/backend/nest_backend/__main__.py
@@ -1,8 +1,12 @@
+"""
+This is the runner for the server.
+"""
 from flask import Flask
 import os
 import werkzeug.middleware.proxy_fix
 from .routes import *
-from .database import Base
+from database import Base, tables
+import psycopg2
 
 
 app = Flask(__name__)
@@ -12,13 +16,11 @@ else:
     app.secret_key = "testing"
 reverse_proxy_app = werkzeug.middleware.proxy_fix.ProxyFix(app=app, x_for=1, x_proto=0, x_host=1, x_port=0, x_prefix=0)
 app.config['SQLALCHEMY_DATABASE_URI'] = 'postgresql://postgres:password@localhost:5432/PdSDev'
-
+Base.app = app
+Base.init_app(app)
 # Routes setup
 app.add_url_rule("/doa", view_func=page_doa, methods=["GET"])
 
 if __name__ == "__main__":
-    try:
-        Base.create_all()
-    except Exception:
-        pass
+    Base.create_all()
     app.run(debug=True)
diff --git a/code/backend/nest_backend/database/__init__.py b/code/backend/nest_backend/database/__init__.py
index f699f3f..2498170 100644
--- a/code/backend/nest_backend/database/__init__.py
+++ b/code/backend/nest_backend/database/__init__.py
@@ -1,6 +1,6 @@
-from .tables import *
-from .base import Base
-
 """
 This module imports all the tables and the declarative base
-"""
\ No newline at end of file
+"""
+
+from .tables import *
+from .base import Base
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/base.py b/code/backend/nest_backend/database/base.py
index 477d30b..fafa769 100644
--- a/code/backend/nest_backend/database/base.py
+++ b/code/backend/nest_backend/database/base.py
@@ -1,3 +1,7 @@
+"""
+This module creates the declarative base
+"""
 import flask_sqlalchemy
+from sqlalchemy.orm import backref
 
 Base = flask_sqlalchemy.SQLAlchemy()
diff --git a/code/backend/nest_backend/database/tables/Alert.py b/code/backend/nest_backend/database/tables/Alert.py
new file mode 100644
index 0000000..03f058e
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Alert.py
@@ -0,0 +1,19 @@
+"""
+This module defines the Alert database class.
+"""
+
+from ..base import Base
+
+
+class Alert(Base.Model):
+    __tablename__ = "alert"
+    id = Base.Column(Base.Integer, primary_key=True)
+    name = Base.Column(Base.String, nullable=False)
+    limit = Base.Column(Base.Integer, nullable=False)
+    window_size = Base.Column(Base.Integer, nullable=False)
+    # Foreign Keys
+    repository_id = Base.Column(Base.Integer, Base.ForeignKey("repository.id"), nullable=False)
+    # Relationships
+    repository = Base.relationship("Repository", back_populates="alerts")
+    notifications = Base.relationship("Notifications", back_populates="alerts")
+    operations = Base.relationship("BoolOperation", back_populates="alert")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/Authorization.py b/code/backend/nest_backend/database/tables/Authorization.py
new file mode 100644
index 0000000..49f2e51
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Authorization.py
@@ -0,0 +1,13 @@
+"""
+This module defines the Authorization database class.
+"""
+
+from ..base import Base
+
+
+class Authorization(Base.Model):
+    rid = Base.Column(Base.Integer, Base.ForeignKey("repository.id"), primary_key=True)
+    email = Base.Column(Base.String, Base.ForeignKey("user.email"), primary_key=True)
+    # Relationships
+    repository = Base.relationship("Repository", back_populates="authorizations")
+    user = Base.relationship("User", back_populates="authorizations")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/BoolOperation.py b/code/backend/nest_backend/database/tables/BoolOperation.py
new file mode 100644
index 0000000..5fca10d
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/BoolOperation.py
@@ -0,0 +1,25 @@
+"""
+This module defines the BoolOperation database class.
+"""
+
+from ..base import Base, backref
+from .Enums import OperationType
+
+
+class BoolOperation(Base.Model):
+    __tablename__ = "bool_operation"
+    id = Base.Column(Base.Integer, primary_key=True)
+    operation = Base.Column(Base.Enum(OperationType), nullable=False)
+    isRoot = Base.Column(Base.Boolean, default=False, nullable=False)
+    # Foreign Keys
+    condition_id = Base.Column(Base.Integer, Base.ForeignKey("condition.id"))
+    node_1_id = Base.Column(Base.Integer, Base.ForeignKey("bool_operation.id"))
+    node_2_id = Base.Column(Base.Integer, Base.ForeignKey("bool_operation.id"))
+    alert_id = Base.Column(Base.Integer, Base.ForeignKey("alert.id"))
+    # Relationships
+    condition = Base.relationship("Condition", back_populates="operations")
+    node_1 = Base.relationship("BoolOperation", primaryjoin=("bool_operation.c.node_1_id==bool_operation.c.id"),
+                               remote_side="BoolOperation.id", backref=backref("father", uselist=False))
+    node_2 = Base.relationship("BoolOperation", primaryjoin=("bool_operation.c.node_2_id==bool_operation.c.id"),
+                               remote_side="BoolOperation.id", backref=backref("father", uselist=False))
+    alert = Base.relationship("Alert", back_populates="operations")
diff --git a/code/backend/nest_backend/database/tables/Composed.py b/code/backend/nest_backend/database/tables/Composed.py
new file mode 100644
index 0000000..98564de
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Composed.py
@@ -0,0 +1,14 @@
+"""
+This module defines the Composed database class.
+"""
+
+from ..base import Base
+
+
+class Composed(Base.Model):
+    __tablename__ = "composed"
+    rid = Base.Column(Base.Integer, Base.ForeignKey("repository.id"), primary_key=True)
+    snowflake = Base.Column(Base.String, Base.ForeignKey("tweet.snowflake"), primary_key=True)
+    # Relationships
+    repository = Base.relationship("Repository", back_populates="tweets")
+    tweet = Base.relationship("Tweet", back_populates="repositories")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/Condition.py b/code/backend/nest_backend/database/tables/Condition.py
new file mode 100644
index 0000000..46e6ee4
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Condition.py
@@ -0,0 +1,17 @@
+"""
+This module defines the Condition database class.
+"""
+
+from ..base import Base
+from .Enums import ConditionType
+
+
+class Condition(Base.Model):
+    __tablename__ = "condition"
+    id = Base.Column(Base.Integer, primary_key=True)
+    type = Base.Column(Base.Enum(ConditionType), nullable=False)
+    content = Base.Column(Base.String, nullable=False)
+    # Relationships
+    used = Base.relationship("Uses", back_populates="condition")
+    tweets = Base.relationship("Contains", back_populates="condition")
+    operations = Base.relationship("BoolOperation", back_populates="condition")
diff --git a/code/backend/nest_backend/database/tables/Contains.py b/code/backend/nest_backend/database/tables/Contains.py
new file mode 100644
index 0000000..7ddbaae
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Contains.py
@@ -0,0 +1,14 @@
+"""
+This module defines the Contains database class.
+"""
+
+from ..base import Base
+
+
+class Contains(Base.Model):
+    __tablename__ = "contains"
+    cid = Base.Column(Base.Integer, Base.ForeignKey("condition.id"), primary_key=True)
+    snowflake = Base.Column(Base.String, Base.ForeignKey("tweet.snowflake"), primary_key=True)
+    # Relationships
+    condition = Base.relationship("Condition", back_populates="tweets")
+    tweet = Base.relationship("Tweet", back_populates="conditions")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/Enums.py b/code/backend/nest_backend/database/tables/Enums.py
new file mode 100644
index 0000000..512c332
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Enums.py
@@ -0,0 +1,18 @@
+"""
+This module contains the main enum definitions.
+"""
+
+import enum
+
+
+class ConditionType(enum.Enum):
+    hashtag = 0
+    location = 1
+    time = 2
+
+
+class OperationType(enum.Enum):
+    _and = 0
+    _or = 1
+    _not = 2
+    assign = 3
diff --git a/code/backend/nest_backend/database/tables/Notification.py b/code/backend/nest_backend/database/tables/Notification.py
new file mode 100644
index 0000000..ae751b4
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Notification.py
@@ -0,0 +1,14 @@
+"""
+This module defines the Notification database class.
+"""
+
+from ..base import Base
+
+class Notification(Base.Model):
+    __tablename__ = "notification"
+    id = Base.Column(Base.Integer, primary_key=True)
+    ora = Base.Column(Base.DateTime, nullable=False)
+    # Foreign Key
+    alert_id = Base.Column(Base.Integer, Base.ForeignKey("alert.id"), nullable=False)
+    # Relationships
+    alert = Base.relationship("Alert", back_populates="notifications")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/Repository.py b/code/backend/nest_backend/database/tables/Repository.py
new file mode 100644
index 0000000..1a14cfa
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Repository.py
@@ -0,0 +1,20 @@
+"""
+This module defines the Repository database class.
+"""
+
+from ..base import Base
+
+
+class Repository(Base.Model):
+    __tablename__ = "repository"
+    id = Base.Column(Base.Integer, primary_key=True)
+    name = Base.Column(Base.String, nullable=False)
+    start = Base.Column(Base.DateTime, nullable=False)
+    end = Base.Column(Base.DateTime, nullable=False)
+    # Foreign Keys
+    owner_id = Base.Column(Base.String, Base.ForeignKey("user.email"), nullable=False)
+    # Relationships
+    owner = Base.relationship("User", back_populates="owner_of")
+    authorizations = Base.relationship("Authorization", back_populates="repository")
+    tweets = Base.relationship("Composed", back_populates="repository")
+    alerts = Base.relationship("Alert", back_populates="repository")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/Tweet.py b/code/backend/nest_backend/database/tables/Tweet.py
new file mode 100644
index 0000000..e90c25c
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Tweet.py
@@ -0,0 +1,16 @@
+"""
+This module defines the Tweet database class.
+"""
+
+from ..base import Base
+
+
+class Tweet(Base.Model):
+    __tablename__ = "tweet"
+    snowflake = Base.Column(Base.String, primary_key=True)
+    content = Base.Column(Base.String)
+    location = Base.Column(Base.String)  # Todo: see if a dedicated class for locations is needed. This is likely.
+    poster = Base.Column(Base.String)  # Todo: see if a dedicated class for posters is needed.
+    # Relationships
+    repositories = Base.relationship("Composed", back_populates="tweet")
+    conditions = Base.relationship("Contains", back_populates="tweet")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/User.py b/code/backend/nest_backend/database/tables/User.py
new file mode 100644
index 0000000..f54f0bf
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/User.py
@@ -0,0 +1,16 @@
+"""
+This module defines the User database class.
+"""
+
+from ..base import Base
+
+
+class User(Base.Model):
+    __tablename__ = "user"
+    email = Base.Column(Base.String, primary_key=True)
+    username = Base.Column(Base.String, nullable=False)
+    password = Base.Column(Base.LargeBinary, nullable=False)
+    isAdmin = Base.Column(Base.Boolean, default=False)
+    # Relationships
+    owner_of = Base.relationship("Repository", back_populates="owner")
+    authorizations = Base.relationship("Authorization", back_populates="user")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/Uses.py b/code/backend/nest_backend/database/tables/Uses.py
new file mode 100644
index 0000000..dbfa74d
--- /dev/null
+++ b/code/backend/nest_backend/database/tables/Uses.py
@@ -0,0 +1,14 @@
+"""
+This module defines the Uses database class.
+"""
+
+from ..base import Base
+
+
+class Uses(Base.Model):
+    __tablename__ = "uses"
+    rid = Base.Column(Base.Integer, Base.ForeignKey("repository.id"), primary_key=True)
+    cid = Base.Column(Base.Integer, Base.ForeignKey("condition.id"), primary_key=True)
+    # Relationships
+    repository = Base.relationship("Repository", back_populates="uses")
+    condition = Base.relationship("Condition", back_populates="used")
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/Utente.py b/code/backend/nest_backend/database/tables/Utente.py
deleted file mode 100644
index 9d11a92..0000000
--- a/code/backend/nest_backend/database/tables/Utente.py
+++ /dev/null
@@ -1,8 +0,0 @@
-from ..base import Base
-
-
-class Utente(Base.Model):
-    __tablename__ = "utente"
-    email = Base.Column(Base.String, primary_key=True)
-    username = Base.Column(Base.String, nullable=False)
-    password = Base.Column(Base.LargeBinary, nullable=False)
\ No newline at end of file
diff --git a/code/backend/nest_backend/database/tables/__init__.py b/code/backend/nest_backend/database/tables/__init__.py
index 339563a..1b80d7b 100644
--- a/code/backend/nest_backend/database/tables/__init__.py
+++ b/code/backend/nest_backend/database/tables/__init__.py
@@ -1,5 +1,15 @@
-from .Utente import Utente
-
 """
 This module contains all database classes.
-"""
\ No newline at end of file
+"""
+
+from .Alert import Alert
+from .Authorization import Authorization
+from .BoolOperation import BoolOperation
+from .Composed import Composed
+from .Condition import Condition
+from .Contains import Contains
+from .Notification import Notification
+from .Repository import Repository
+from .Tweet import Tweet
+from .User import User
+from .Uses import Uses
diff --git a/code/backend/nest_backend/routes/__init__.py b/code/backend/nest_backend/routes/__init__.py
index 80d20c1..1a1609c 100644
--- a/code/backend/nest_backend/routes/__init__.py
+++ b/code/backend/nest_backend/routes/__init__.py
@@ -1,5 +1,5 @@
-from .doa import page_doa
-
 """
 This module imports all the routes that return something to the frontend.
-"""
\ No newline at end of file
+"""
+
+from .doa import page_doa
\ No newline at end of file
diff --git a/code/backend/nest_backend/routes/doa.py b/code/backend/nest_backend/routes/doa.py
index 2ea0f46..58ff15f 100644
--- a/code/backend/nest_backend/routes/doa.py
+++ b/code/backend/nest_backend/routes/doa.py
@@ -1,10 +1,12 @@
-from flask import render_template, abort
-from ..database import *
-
 """
 Page that displays a message if the server is on
 """
 
+from flask import render_template, abort
+from ..database import *
+
+
+
 
 def page_doa():
     utente = Utente()
diff --git a/code/backend/poetry.lock b/code/backend/poetry.lock
index 8cf35fd..5ebbdf2 100644
--- a/code/backend/poetry.lock
+++ b/code/backend/poetry.lock
@@ -78,9 +78,17 @@ category = "main"
 optional = false
 python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
 
+[[package]]
+name = "psycopg2"
+version = "2.8.6"
+description = "psycopg2 - Python-PostgreSQL Database Adapter"
+category = "main"
+optional = false
+python-versions = ">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*"
+
 [[package]]
 name = "sqlalchemy"
-version = "1.4.9"
+version = "1.4.10"
 description = "Database Abstraction Library"
 category = "main"
 optional = false
@@ -123,8 +131,8 @@ watchdog = ["watchdog"]
 
 [metadata]
 lock-version = "1.1"
-python-versions = "^3.8"
-content-hash = "1c4775c88c3f9f7f9ceb05ec717052a69039f2d7d9f44cbdb348330be98c118e"
+python-versions = "^3.8.5"
+content-hash = "71b957004ae80674013de8327f592dd17b9ffb4e5c6a865e69326555f9c2a1ce"
 
 [metadata.files]
 click = [
@@ -227,41 +235,58 @@ markupsafe = [
     {file = "MarkupSafe-1.1.1-cp38-cp38-win_amd64.whl", hash = "sha256:e8313f01ba26fbbe36c7be1966a7b7424942f670f38e666995b88d012765b9be"},
     {file = "MarkupSafe-1.1.1.tar.gz", hash = "sha256:29872e92839765e546828bb7754a68c418d927cd064fd4708fab9fe9c8bb116b"},
 ]
+psycopg2 = [
+    {file = "psycopg2-2.8.6-cp27-cp27m-win32.whl", hash = "sha256:068115e13c70dc5982dfc00c5d70437fe37c014c808acce119b5448361c03725"},
+    {file = "psycopg2-2.8.6-cp27-cp27m-win_amd64.whl", hash = "sha256:d160744652e81c80627a909a0e808f3c6653a40af435744de037e3172cf277f5"},
+    {file = "psycopg2-2.8.6-cp34-cp34m-win32.whl", hash = "sha256:b8cae8b2f022efa1f011cc753adb9cbadfa5a184431d09b273fb49b4167561ad"},
+    {file = "psycopg2-2.8.6-cp34-cp34m-win_amd64.whl", hash = "sha256:f22ea9b67aea4f4a1718300908a2fb62b3e4276cf00bd829a97ab5894af42ea3"},
+    {file = "psycopg2-2.8.6-cp35-cp35m-win32.whl", hash = "sha256:26e7fd115a6db75267b325de0fba089b911a4a12ebd3d0b5e7acb7028bc46821"},
+    {file = "psycopg2-2.8.6-cp35-cp35m-win_amd64.whl", hash = "sha256:00195b5f6832dbf2876b8bf77f12bdce648224c89c880719c745b90515233301"},
+    {file = "psycopg2-2.8.6-cp36-cp36m-win32.whl", hash = "sha256:a49833abfdede8985ba3f3ec641f771cca215479f41523e99dace96d5b8cce2a"},
+    {file = "psycopg2-2.8.6-cp36-cp36m-win_amd64.whl", hash = "sha256:f974c96fca34ae9e4f49839ba6b78addf0346777b46c4da27a7bf54f48d3057d"},
+    {file = "psycopg2-2.8.6-cp37-cp37m-win32.whl", hash = "sha256:6a3d9efb6f36f1fe6aa8dbb5af55e067db802502c55a9defa47c5a1dad41df84"},
+    {file = "psycopg2-2.8.6-cp37-cp37m-win_amd64.whl", hash = "sha256:56fee7f818d032f802b8eed81ef0c1232b8b42390df189cab9cfa87573fe52c5"},
+    {file = "psycopg2-2.8.6-cp38-cp38-win32.whl", hash = "sha256:ad2fe8a37be669082e61fb001c185ffb58867fdbb3e7a6b0b0d2ffe232353a3e"},
+    {file = "psycopg2-2.8.6-cp38-cp38-win_amd64.whl", hash = "sha256:56007a226b8e95aa980ada7abdea6b40b75ce62a433bd27cec7a8178d57f4051"},
+    {file = "psycopg2-2.8.6-cp39-cp39-win32.whl", hash = "sha256:2c93d4d16933fea5bbacbe1aaf8fa8c1348740b2e50b3735d1b0bf8154cbf0f3"},
+    {file = "psycopg2-2.8.6-cp39-cp39-win_amd64.whl", hash = "sha256:d5062ae50b222da28253059880a871dc87e099c25cb68acf613d9d227413d6f7"},
+    {file = "psycopg2-2.8.6.tar.gz", hash = "sha256:fb23f6c71107c37fd667cb4ea363ddeb936b348bbd6449278eb92c189699f543"},
+]
 sqlalchemy = [
-    {file = "SQLAlchemy-1.4.9-cp27-cp27m-macosx_10_14_x86_64.whl", hash = "sha256:e26791ac43806dec1f18d328596db87f1b37f9d8271997dd1233054b4c377f51"},
-    {file = "SQLAlchemy-1.4.9-cp27-cp27m-manylinux1_x86_64.whl", hash = "sha256:c4485040d86d4b3d9aa509fd3c492de3687d9bf52fb85d66b33912ad068a088c"},
-    {file = "SQLAlchemy-1.4.9-cp27-cp27m-win32.whl", hash = "sha256:a8763fe4de02f746666161b130cc3e5d1494a6f5475f5622f05251739fc22e55"},
-    {file = "SQLAlchemy-1.4.9-cp27-cp27m-win_amd64.whl", hash = "sha256:e7d262415e4adf148441bd9f10ae4e5498d6649962fabc62a64ec7b4891d56c5"},
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 ]
 werkzeug = [
     {file = "Werkzeug-1.0.1-py2.py3-none-any.whl", hash = "sha256:2de2a5db0baeae7b2d2664949077c2ac63fbd16d98da0ff71837f7d1dea3fd43"},
diff --git a/code/backend/pyproject.toml b/code/backend/pyproject.toml
index 7dc7030..5f87c99 100644
--- a/code/backend/pyproject.toml
+++ b/code/backend/pyproject.toml
@@ -2,10 +2,11 @@
 name = "g2-progetto"
 version = "0.1.0"
 description = ""
-authors = ["Nemesis <lorenzo.balugani@gmail.com>"]
+authors = ["Lorenzo Balugani <lorenzo.balugani@gmail.com>"]
 
 [tool.poetry.dependencies]
-python = "^3.8"
+python = "^3.8.5"
+psycopg2 = "^2.8.6"
 Flask = "^1.1.2"
 Flask-SQLAlchemy = "^2.5.1"