diff --git a/database_setup/database_test.py b/database_setup/database_test.py
index ab3d577..2cfe522 100644
--- a/database_setup/database_test.py
+++ b/database_setup/database_test.py
@@ -1,14 +1,72 @@
-from sqlmodel import BigInteger, Column, Field, SQLModel, create_engine
+from sqlalchemy.dialects.mysql import BIGINT, SMALLINT
+from sqlmodel import Column, Field, ForeignKey, Relationship, Session, SQLModel, UniqueConstraint, create_engine
 
 
-class Guilds(SQLModel, table=True):
-    id: int = Field(sa_column=Column(BigInteger(), primary_key=True))
+class Guild(SQLModel, table=True):
+    """
+    Represents a Guild entity in the database.
+
+    Attributes:
+        id (int): The unique identifier for the guild.
+        name (str): The name of the guild.
+        submission_channel (int): The ID of the submission channel associated with the guild.
+        verification_channel (int): The ID of the verification channel associated with the guild.
+        active (bool): Indicates whether the guild is active. Defaults to True.
+        category_groups (list[CategoryGroup]): A list of category groups associated with the guild.
+    """
+
+    __tablename__: str = "Guilds"
+
+    id: int = Field(sa_column=Column(BIGINT(unsigned=True), primary_key=True))
     name: str = Field(max_length=95)
-    submission_channel: int = Field(sa_column=Column(BigInteger()))
-    verification_channel: int = Field(sa_column=Column(BigInteger()))
+    submission_channel: int = Field(sa_column=Column(BIGINT(unsigned=True)))
+    verification_channel: int = Field(sa_column=Column(BIGINT(unsigned=True)))
     active: bool = Field(default=True)
 
+    category_groups: list["CategoryGroup"] = Relationship(back_populates="guild", cascade_delete=True)
+
+
+class CategoryGroup(SQLModel, table=True):
+    """
+    Represents a category group in the database.
+
+    Attributes:
+        id (int | None): The primary key of the category group.
+        name (str): The name of the category group, with a maximum length of 50 characters.
+        channel_id (int): The ID of the channel associated with the category group.
+        guild_id (int): The ID of the guild associated with the category group.
+        message_id (int): The ID of the message associated with the category group.
+        pad_length (int): The padding length for the category group, default is 12.
+        username_length (int): The username length for the category group, default is 12.
+        guild (Guild | None): The guild relationship back-populated from the Guild model.
+    """
+
+    __tablename__: str = "CategoryGroups"
+
+    id: int | None = Field(default=None, primary_key=True)
+    name: str = Field(max_length=50)
+    channel_id: int = Field(sa_column=Column(BIGINT(unsigned=True)))
+    guild_id: int = Field(sa_column=Column(BIGINT(unsigned=True), ForeignKey("Guilds.id", ondelete="CASCADE")))
+    message_id: int = Field(sa_column=Column(BIGINT(unsigned=True)))
+    pad_length: int = Field(default=12, sa_column=Column(SMALLINT(unsigned=True)))
+    username_length: int = Field(default=12, sa_column=Column(SMALLINT(unsigned=True)))
+
+    __table_args__ = (UniqueConstraint("guild_id", "name", name="UniqueGuildCategoryGroup"),)
+
+    guild: Guild | None = Relationship(back_populates="category_groups")
+
 
 url = "sqlite:///database.db"
 engine = create_engine(url)
 SQLModel.metadata.create_all(engine)
+
+with Session(engine) as session:
+    guild = Guild(id=1, name="test guild", submission_channel=1, verification_channel=2)
+    session.add(guild)
+
+    group1 = CategoryGroup(name="group1", channel_id=1, guild_id=1, message_id=1)
+    group2 = CategoryGroup(name="group1", channel_id=2, guild_id=1, message_id=2)
+    session.add(group1)
+    session.add(group2)
+
+    session.commit()