diff --git a/backend/src/routes/tags.py b/backend/src/routes/tags.py
index c785590..d91ed7f 100644
--- a/backend/src/routes/tags.py
+++ b/backend/src/routes/tags.py
@@ -1,54 +1,93 @@
 import logging
 from datetime import datetime, timedelta
 
-from fastapi import APIRouter, status, Path
-from src.models.tag import TagRead, TagCreate
+import sqlalchemy.exc
+from fastapi import APIRouter, status, Path, Depends, HTTPException
+from sqlmodel import Session, select
+
+from src import database
+from src.models.tag import TagRead, TagCreate, Tag
 
 router = APIRouter(prefix="/tags", tags=["Tags"])
 
 
 @router.get("/", response_model=list[TagRead], summary="Get a list of all tags")
-async def all_tags() -> list[TagRead]:
+async def all_tags(
+        *,
+        session: Session = Depends(database.get_session)
+) -> list[Tag]:
     """Returns a list of all tags."""
 
-    return [
-        TagRead(
-            name="Listening Lectures",
-            duration=timedelta(days=3, hours=5, minutes=47),
-        ),
-        TagRead(
-            name="Doing homework",
-            duration=timedelta(hours=14, minutes=10),
-        )
-    ]
+    tags = session.exec(select(Tag)).all()
+    return tags
 
 
 @router.post("/", status_code=status.HTTP_201_CREATED, summary="Add a tag")
-async def add_tag(tag: TagCreate):
+async def add_tag(
+        *,
+        tag: TagCreate,
+        session: Session = Depends(database.get_session)
+):
     """Add a tag."""
 
-    print('adding tag', tag)
+    db_tag = Tag.from_orm(tag)
+    session.add(db_tag)
+    session.commit()
+    session.refresh(db_tag)
+    return db_tag
 
 
 @router.get("/{name}", response_model=TagRead, summary="Get a project by name")
-async def get_tag(name: str = Path(..., title="Name of the tag")) -> TagRead:
+async def get_tag(
+        *,
+        name: str = Path(..., title="Name of the tag"),
+        session: Session = Depends(database.get_session)
+) -> Tag:
     """Fetch a project by name."""
 
-    return TagRead(
-        name=name,
-        duration=timedelta(hours=3, minutes=2),
-    )
+    try:
+        tag = session.exec(select(Tag).where(Tag.name == name)).one()
+        return tag
+    except sqlalchemy.exc.NoResultFound:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
 
 
 @router.delete("/{name}", status_code=status.HTTP_204_NO_CONTENT, summary="Delete a tag by name")
-async def delete_tag(name: str = Path(..., title="Name of the tag")):
+async def delete_tag(
+        *,
+        name: str = Path(..., title="Name of the tag"),
+        session: Session = Depends(database.get_session)
+):
     """Delete a tag specified by name."""
 
-    logging.debug(f"Deleting tag {name}")
+    tag = session.exec(select(Tag).where(Tag.name == name)).one()
+    session.delete(tag)
+    session.commit()
+    # TODO: This method implicitly returns None, which will be converted to null by FastAPI, which triggers a
+    #  warning, because the method returns with header HTTP_204_NO_CONTENT, but has content
 
 
 @router.patch("/{name}", summary="Apply partial updates to a tag by name")
-async def patch_tag(tag: TagCreate, name: str = Path(..., title="Name of the tag")):
+async def patch_tag(
+        *,
+        tag: TagCreate,
+        name: str = Path(..., title="Name of the tag"),
+        session: Session = Depends(database.get_session)
+):
     """Apply partial updates to a tag."""
 
-    logging.debug(f"Patching tag {name} with {tag}")
+    # Search for tag with name in database
+    try:
+        db_tag = session.exec(select(Tag).where(Tag.name == name)).one()
+    except sqlalchemy.exc.NoResultFound:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND)
+
+    # Set all provided arguments in the database project
+    for key, value in tag.dict(exclude_unset=True).items():
+        setattr(db_tag, key, value)
+
+    # Write modified tag to database
+    session.add(db_tag)
+    session.commit()
+    session.refresh(db_tag)
+    return db_tag