diff --git a/backend/howtheyvote/alembic/versions/2f958a6f147d_add_checksum_column_to_pipeline_runs_.py b/backend/howtheyvote/alembic/versions/2f958a6f147d_add_checksum_column_to_pipeline_runs_.py
new file mode 100644
index 00000000..c7beec80
--- /dev/null
+++ b/backend/howtheyvote/alembic/versions/2f958a6f147d_add_checksum_column_to_pipeline_runs_.py
@@ -0,0 +1,24 @@
+"""Add checksum column to pipeline_runs table
+
+Revision ID: 2f958a6f147d
+Revises: 9b35d19b64c4
+Create Date: 2024-12-07 17:12:10.792707
+
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "2f958a6f147d"
+down_revision = "9b35d19b64c4"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    op.add_column("pipeline_runs", sa.Column("checksum", sa.Unicode))
+
+
+def downgrade() -> None:
+    op.drop_column("pipeline_runs", "checksum")
diff --git a/backend/howtheyvote/models/common.py b/backend/howtheyvote/models/common.py
index ef084442..7d1e1ad8 100644
--- a/backend/howtheyvote/models/common.py
+++ b/backend/howtheyvote/models/common.py
@@ -40,6 +40,7 @@ class PipelineRunResult(Enum):
     SUCCESS = "SUCCESS"
     FAILURE = "FAILURE"
     DATA_UNAVAILABLE = "DATA_UNAVAILABLE"
+    DATA_UNCHANGED = "DATA_UNCHANGED"
 
 
 class PipelineRun(Base):
@@ -50,3 +51,4 @@ class PipelineRun(Base):
     finished_at: Mapped[sa.DateTime] = mapped_column(sa.DateTime)
     pipeline: Mapped[str] = mapped_column(sa.Unicode)
     result: Mapped[PipelineRunResult] = mapped_column(sa.Enum(PipelineRunResult))
+    checksum: Mapped[str] = mapped_column(sa.Unicode)
diff --git a/backend/howtheyvote/worker/__init__.py b/backend/howtheyvote/worker/__init__.py
index 36ac5f28..07e8c386 100644
--- a/backend/howtheyvote/worker/__init__.py
+++ b/backend/howtheyvote/worker/__init__.py
@@ -10,14 +10,14 @@
 from ..export import generate_export
 from ..files import file_path
 from ..models import PipelineRun, PipelineRunResult, PlenarySession
-from ..pipelines import MembersPipeline, PressPipeline, RCVListPipeline, SessionsPipeline
+from ..pipelines import BasePipeline, MembersPipeline, PressPipeline, RCVListPipeline, SessionsPipeline
 from ..query import session_is_current_at
 from .worker import SkipPipelineError, Weekday, Worker, pipeline_ran_successfully
 
 log = get_logger(__name__)
 
 
-def op_rcv_midday() -> None:
+def op_rcv_midday() -> BasePipeline:
     """Checks if there is a current plenary session and, if yes, fetches the latest roll-call
     vote results."""
     today = datetime.date.today()
@@ -31,8 +31,10 @@ def op_rcv_midday() -> None:
     pipeline = RCVListPipeline(term=config.CURRENT_TERM, date=today)
     pipeline.run()
 
+    return pipeline
 
-def op_rcv_evening() -> None:
+
+def op_rcv_evening() -> BasePipeline:
     """While on most plenary days, there’s only one voting session around midday, on some days
     there is another sesssion in the evening, usually around 17:00. The vote results of the
     evening sessions are appended to the same source document that also contains the results
@@ -49,8 +51,10 @@ def op_rcv_evening() -> None:
     pipeline = RCVListPipeline(term=config.CURRENT_TERM, date=today)
     pipeline.run()
 
+    return pipeline
+
 
-def op_press() -> None:
+def op_press() -> BasePipeline:
     """Checks if there is a current plenary session and, if yes, fetches the latest press
     releases from the Parliament’s news hub."""
     today = datetime.date.today()
@@ -61,18 +65,24 @@ def op_press() -> None:
     pipeline = PressPipeline(date=today, with_rss=True)
     pipeline.run()
 
+    return pipeline
+
 
-def op_sessions() -> None:
+def op_sessions() -> BasePipeline:
     """Fetches plenary session dates."""
     pipeline = SessionsPipeline(term=config.CURRENT_TERM)
     pipeline.run()
 
+    return pipeline
 
-def op_members() -> None:
+
+def op_members() -> BasePipeline:
     """Fetches information about all members of the current term."""
     pipeline = MembersPipeline(term=config.CURRENT_TERM)
     pipeline.run()
 
+    return pipeline
+
 
 EXPORT_LAST_RUN = Gauge(
     "htv_export_last_run_timestamp_seconds",
diff --git a/backend/howtheyvote/worker/worker.py b/backend/howtheyvote/worker/worker.py
index 91667c61..edf3bfee 100644
--- a/backend/howtheyvote/worker/worker.py
+++ b/backend/howtheyvote/worker/worker.py
@@ -15,7 +15,7 @@
 from .. import config
 from ..db import Session
 from ..models import PipelineRun, PipelineRunResult
-from ..pipelines import DataUnavailableError
+from ..pipelines import BasePipeline, DataUnavailableError, DataUnchangedError
 
 log = get_logger(__name__)
 
@@ -150,7 +150,7 @@ def schedule(
 
     def schedule_pipeline(
         self,
-        handler: Handler,
+        handler: Callable[..., BasePipeline],
         name: str,
         weekdays: Iterable[Weekday] = set(Weekday),
         hours: Iterable[int] = {0},
@@ -164,13 +164,15 @@ def wrapped_handler() -> None:
             started_at = datetime.datetime.now(datetime.UTC)
 
             try:
-                handler()
+                pipeline = handler()
                 result = PipelineRunResult.SUCCESS
             except SkipPipelineError:
                 # Do not log skipped pipeline runs
                 return
             except DataUnavailableError:
                 result = PipelineRunResult.DATA_UNAVAILABLE
+            except DataUnchangedError:
+                result = PipelineRunResult.DATA_UNCHANGED
             except Exception:
                 result = PipelineRunResult.FAILURE
 
@@ -186,6 +188,7 @@ def wrapped_handler() -> None:
                 started_at=started_at,
                 finished_at=finished_at,
                 result=result.value,
+                checksum=pipeline.checksum,
             )
 
             Session.add(run)