diff --git a/docs/usage/snapshots.md b/docs/usage/snapshots.md
index bef581e..3436e4a 100644
--- a/docs/usage/snapshots.md
+++ b/docs/usage/snapshots.md
@@ -82,15 +82,15 @@ The comment is optional but useful for identifying the snapshot later.
 === "CLI"
 
     ```bash
-    aimbat snapshot list <ID>              # for a specific event
-    aimbat snapshot list --all-events      # across all events
+    aimbat snapshot list <ID>  # for a specific event
+    aimbat snapshot list all   # across all events
     ```
 
 === "Shell"
 
     ```bash
-    snapshot list                          # uses the current event context
-    snapshot list --all-events
+    snapshot list <ID>  # uses the current event context
+    snapshot list all   # across all events
     ```
 
 The table shows the snapshot ID, date and time, comment, and number of
@@ -128,7 +128,7 @@ Before rolling back, it can be useful to see what a snapshot contains.
     snapshot preview --matrix <SNAPSHOT_ID>
     ```
 
-`details` shows the event-level parameters (window, filter, min_ccnorm) as
+`details` shows the event-level parameters (window, filter, min_cc) as
 they were when the snapshot was taken. `preview` builds the ICCS stack from
 the snapshot's parameters and displays it — without modifying anything in
 the database.
@@ -224,15 +224,13 @@ For archiving or scripting purposes, snapshot data can be exported to JSON:
 === "CLI"
 
     ```bash
-    aimbat snapshot dump <ID>             # specific event
-    aimbat snapshot dump --all-events     # all events
+    aimbat snapshot dump
     ```
 
 === "Shell"
 
     ```bash
-    snapshot dump                         # uses the current event context
-    snapshot dump --all-events
+    snapshot dump
     ```
 
 The output is a JSON object with five keys, all cross-referenced by
@@ -317,17 +315,17 @@ without opening individual snapshot records:
 === "CLI"
 
     ```bash
-    aimbat snapshot quality list <ID>          # for a specific event
-    aimbat snapshot quality list --all-events  # across all events
-    aimbat snapshot quality dump               # raw JSON export
+    aimbat snapshot quality list <ID>  # for a specific event
+    aimbat snapshot quality list all   # across all events
+    aimbat snapshot quality dump       # raw JSON export
     ```
 
 === "Shell"
 
     ```bash
-    snapshot quality list
-    snapshot quality list --all-events
-    snapshot quality dump
+    snapshot quality list <ID>  # for a specific event
+    snapshot quality list all   # across all events
+    snapshot quality dump       # raw JSON export
     ```
 
 The table shows per-snapshot aggregated ICCS correlation coefficients and, where
diff --git a/src/aimbat/_cli/common/_parameters.py b/src/aimbat/_cli/common/_parameters.py
index 75cfaf6..32620f5 100644
--- a/src/aimbat/_cli/common/_parameters.py
+++ b/src/aimbat/_cli/common/_parameters.py
@@ -232,7 +232,14 @@ def open_in_editor(initial_content: str) -> str:
         tmp_path = tmp.name
 
     try:
-        subprocess.run([*shlex.split(editor), tmp_path], check=False)
+        result = subprocess.run([*shlex.split(editor), tmp_path], check=False)
+        if result.returncode != 0:
+            from aimbat.logger import logger
+
+            logger.warning(
+                f"Editor '{editor}' exited with code {result.returncode}; discarding changes."
+            )
+            return initial_content
         with open(tmp_path, encoding="utf-8") as f:
             return f.read()
     finally:
diff --git a/src/aimbat/_cli/snapshot.py b/src/aimbat/_cli/snapshot.py
index c8f271f..15a3ae3 100644
--- a/src/aimbat/_cli/snapshot.py
+++ b/src/aimbat/_cli/snapshot.py
@@ -125,7 +125,17 @@ def cli_snapshot_rollback(
     *,
     _: DebugParameter = DebugParameter(),
 ) -> None:
-    """Rollback to snapshot."""
+    """Restore saved parameters from a snapshot as the current live values.
+
+    Overwrites the current event and per-seismogram parameters for the event
+    with those recorded in the snapshot. Any ICCS runs or parameter changes
+    made after the snapshot was taken are undone. The snapshot itself is not
+    deleted — you can roll back to it again.
+
+    If the snapshot has MCCC quality data, the live quality metrics are also
+    restored from the best matching snapshot (same parameter hash, most recent
+    MCCC run).
+    """
     from sqlmodel import Session
 
     from aimbat.core import rollback_to_snapshot
diff --git a/src/aimbat/_cli/tool.py b/src/aimbat/_cli/tool.py
index 0c8c527..8bde6b6 100644
--- a/src/aimbat/_cli/tool.py
+++ b/src/aimbat/_cli/tool.py
@@ -136,7 +136,7 @@ def cli_pick_min_cc(
 ) -> None:
     """Interactively pick a new minimum cross-correlation for auto-selection.
 
-    Opens an interactive plot; click to set the cc threshold. Seismograms
+    Opens an interactive plot; scroll to set the cc threshold. Seismograms
     whose cross-correlation with the stack falls below this value will be
     automatically de-selected when running ICCS with `--autoselect`.
     """
diff --git a/src/aimbat/_tui/help/tab-project.md b/src/aimbat/_tui/help/tab-project.md
index 6e86c79..13aea54 100644
--- a/src/aimbat/_tui/help/tab-project.md
+++ b/src/aimbat/_tui/help/tab-project.md
@@ -16,10 +16,12 @@ ICCS status:
 
 - **● ICCS ready** — the event's seismograms are loaded in memory and
   alignment can run. This is the normal working state.
-- **○ no ICCS** — the ICCS instance could not be built. Usually this means
-  a parameter combination is invalid (e.g. the time window is too wide)
-  or a waveform file is missing. Fix the problem and the status updates
-  automatically.
+- **○ no ICCS** — ICCS is built automatically in the background when you
+  select an event. If this status persists, the ICCS instance could not be
+  built — usually because a parameter combination is invalid or a waveform
+  file is missing. Press `p` to check the event parameters; the most common
+  cause is a time window longer than the available waveform data. Fix the
+  problem and the status updates automatically.
 
 ### Events table (top)
 
diff --git a/src/aimbat/_tui/help/tab-seismograms.md b/src/aimbat/_tui/help/tab-seismograms.md
index 14373c9..f8c86ce 100644
--- a/src/aimbat/_tui/help/tab-seismograms.md
+++ b/src/aimbat/_tui/help/tab-seismograms.md
@@ -33,10 +33,10 @@ algorithm. It cross-correlates each selected seismogram against the current
 stack waveform, adjusts the picks, rebuilds the stack, and repeats until
 convergence. Only seismograms with `Select = ✓` contribute to the stack.
 
-The Stack CC column updates live as soon as the event is loaded — it shows
-how well each seismogram matches the current stack, even before you run
-alignment. After running ICCS (`a`), the picks (Δt) and Stack CC values are
-updated and written to the database immediately.
+The Stack CC column is recalculated each time the event is loaded or after
+any parameter change — it shows how well each seismogram matches the current
+stack, even before you run alignment. After running ICCS (`a`), the picks
+(Δt) and Stack CC values are updated and written to the database immediately.
 
 ### Seismogram plot (right panel)
 
diff --git a/src/aimbat/_tui/help/tab-snapshots.md b/src/aimbat/_tui/help/tab-snapshots.md
index 3aaacf5..3899e16 100644
--- a/src/aimbat/_tui/help/tab-snapshots.md
+++ b/src/aimbat/_tui/help/tab-snapshots.md
@@ -35,8 +35,8 @@ needed. Each snapshot has its own note, which persists in the database.
 
 ## What a snapshot captures
 
-- **Event parameters** — time window (`t0`/`t1` window bounds), bandpass
-  filter settings, and Min CC threshold
+- **Event parameters** — time window (pre- and post-pick window lengths),
+  bandpass filter settings, and Min CC threshold
 - **Per-seismogram parameters** — the `t1` pick, `select` flag, and `flip`
   flag for every seismogram
 - **Quality metrics** — ICCS correlation coefficients per seismogram (always captured);
diff --git a/src/aimbat/core/_data.py b/src/aimbat/core/_data.py
index f017c97..4ed1116 100644
--- a/src/aimbat/core/_data.py
+++ b/src/aimbat/core/_data.py
@@ -81,6 +81,15 @@ def _create_event(
         logger.debug(
             f"Using existing event {aimbat_event.time} instead of adding new one."
         )
+        if (
+            new_aimbat_event.latitude != aimbat_event.latitude
+            or new_aimbat_event.longitude != aimbat_event.longitude
+            or new_aimbat_event.depth != aimbat_event.depth
+        ):
+            logger.warning(
+                f"Event at {aimbat_event.time} matched by time but has different "
+                f"location metadata in {datasource}. The existing record will be used."
+            )
     return aimbat_event
 
 
@@ -136,7 +145,9 @@ def _process_datasource(
     # Resolve event — use the provided UUID, extract from the source, or skip
     if event_id is not None:
         aimbat_event: AimbatEvent | None = session.get(AimbatEvent, event_id)
-        logger.debug(f"Using event {aimbat_event.time} (ID={event_id}).")  # type: ignore[union-attr]
+        if aimbat_event is None:
+            raise ValueError(f"No event found with ID={event_id}.")
+        logger.debug(f"Using event {aimbat_event.time} (ID={event_id}).")
     elif supports_event_creation(datatype):
         aimbat_event = _create_event(session, datasource, datatype)
     else:
@@ -148,12 +159,12 @@ def _process_datasource(
 
     # Seismogram creation requires both a station and an event to link to
     if aimbat_station is None:
-        raise NotImplementedError(
+        raise ValueError(
             f"{datatype} does not support station creation. "
             "Provide a station UUID via --use-station."
         )
     if aimbat_event is None:
-        raise NotImplementedError(
+        raise ValueError(
             f"{datatype} does not support event creation. "
             "Provide an event UUID via --use-event."
         )
diff --git a/src/aimbat/core/_event.py b/src/aimbat/core/_event.py
index 4c8e6b6..c431dfa 100644
--- a/src/aimbat/core/_event.py
+++ b/src/aimbat/core/_event.py
@@ -8,7 +8,7 @@
 from pydantic import TypeAdapter
 from sqlalchemy.exc import NoResultFound
 from sqlalchemy.orm import selectinload
-from sqlmodel import Session, select
+from sqlmodel import Session, col, select
 
 from aimbat._types import EventParameter
 from aimbat.logger import logger
@@ -51,7 +51,7 @@ def resolve_event(session: Session, event_id: UUID | None = None) -> AimbatEvent
         NoResultFound: If no event_id is given.
     """
     if event_id:
-        logger.debug(f"Resolving event by explicit ID: {event_id}")
+        logger.debug(f"Resolving event by explicit ID: {event_id}.")
         event = session.get(AimbatEvent, event_id)
         if event is None:
             raise NoResultFound(f"No AimbatEvent found with id: {event_id}.")
@@ -108,7 +108,7 @@ def get_completed_events(session: Session) -> Sequence[AimbatEvent]:
     statement = (
         select(AimbatEvent)
         .join(AimbatEventParameters)
-        .where(AimbatEventParameters.completed == 1)
+        .where(col(AimbatEventParameters.completed).is_(True))
     )
 
     return session.exec(statement).all()
@@ -157,7 +157,9 @@ def get_event_quality(session: Session, event_id: UUID) -> SeismogramQualityStat
         event_id: UUID of the event.
 
     Returns:
-        Aggregated seismogram quality statistics.
+        Aggregated seismogram quality statistics. The `mccc_rmse` field is
+        taken from the event-level quality record rather than the per-seismogram
+        records, and is `None` if MCCC has not been run.
 
     Raises:
         NoResultFound: If no event with the given ID is found.
diff --git a/src/aimbat/core/_iccs.py b/src/aimbat/core/_iccs.py
index f238f43..85aa0ef 100644
--- a/src/aimbat/core/_iccs.py
+++ b/src/aimbat/core/_iccs.py
@@ -209,7 +209,9 @@ def _write_mccc_quality(
 
     Upserts the event-level RMSE, clears MCCC fields for all seismograms in
     the ICCS instance, then writes the per-seismogram metrics for the seismograms
-    that were actually used in the inversion.
+    that were actually used in the inversion. The `iccs_cc` field is preserved
+    when an existing quality row is found; seismograms with no prior quality row
+    will have `iccs_cc = NULL` until ICCS stats are written separately.
 
     Uses its own short-lived session.
 
@@ -343,6 +345,7 @@ def build_iccs_from_snapshot(session: Session, snapshot_id: UUID) -> BoundICCS:
             .selectinload(rel(AimbatEvent.seismograms))
             .selectinload(rel(AimbatSeismogram.parameters)),
             selectinload(rel(AimbatSnapshot.event_parameters_snapshot)),
+            selectinload(rel(AimbatSnapshot.seismogram_parameters_snapshots)),
         )
     )
     snapshot = session.exec(statement).one_or_none()
@@ -420,6 +423,9 @@ def validate_iccs_construction(
 def _write_back_seismograms(session: Session, iccs: ICCS) -> None:
     """Write t1, flip, and select from ICCS seismograms back to the database.
 
+    Calls `session.commit()` after writing; any other pending changes on
+    `session` are also committed.
+
     Args:
         session: Database session.
         iccs: ICCS instance whose seismograms carry UUIDs in their extra dict.
@@ -484,7 +490,7 @@ def run_iccs(
         IccsResult from the algorithm run.
     """
 
-    logger.info(f"Running ICCS with {autoflip=}, {autoselect=}.")
+    logger.info(f"Running ICCS (autoflip={autoflip}, autoselect={autoselect}).")
 
     result = iccs(autoflip=autoflip, autoselect=autoselect)
     n_iter = len(result.convergence)
@@ -510,7 +516,9 @@ def run_mccc(
         McccResult from the algorithm run.
     """
 
-    logger.info(f"Running MCCC for event {event.id} with {all_seismograms=}.")
+    logger.info(
+        f"Running MCCC for event {event.id} (all_seismograms={all_seismograms})."
+    )
 
     result = iccs.run_mccc(
         all_seismograms=all_seismograms,
diff --git a/src/aimbat/core/_project.py b/src/aimbat/core/_project.py
index 8715339..6e76f04 100644
--- a/src/aimbat/core/_project.py
+++ b/src/aimbat/core/_project.py
@@ -45,7 +45,7 @@ def create_project(engine: Engine) -> None:
     # Import locally to ensure SQLModel registers all table metadata before create_all()
     import aimbat.models  # noqa: F401
 
-    logger.info(f"Creating new project in {engine.url}")
+    logger.info(f"Creating new project in {engine.url}.")
 
     if _project_exists(engine):
         raise RuntimeError(
@@ -64,7 +64,7 @@ def create_project(engine: Engine) -> None:
                 CREATE TRIGGER IF NOT EXISTS event_modified_on_params_update
                 AFTER UPDATE ON aimbateventparameters
                 BEGIN
-                    UPDATE aimbatevent SET last_modified = datetime('now')
+                    UPDATE aimbatevent SET last_modified = strftime('%Y-%m-%d %H:%M:%f', 'now')
                     WHERE id = NEW.event_id;
                 END;
             """)
@@ -310,18 +310,23 @@ def delete_project(engine: Engine) -> None:
         RuntimeError: If unable to delete project.
     """
 
-    logger.info(f"Deleting project in {engine=}.")
+    logger.info(f"Deleting project at {engine.url}.")
 
-    if _project_exists(engine):
-        if engine.driver == "pysqlite":
-            database = engine.url.database
-            engine.dispose()
-            if database == ":memory:":
-                logger.info("Running database in memory, nothing to delete.")
-                return
-            elif database:
-                project_path = Path(database)
-                logger.info(f"Deleting project file: {project_path=}")
-                project_path.unlink()
-                return
-    raise RuntimeError("Unable to find/delete project.")
+    if not _project_exists(engine):
+        raise RuntimeError("No project found to delete.")
+
+    if engine.driver == "pysqlite":
+        database = engine.url.database
+        engine.dispose()
+        if database == ":memory:":
+            logger.info("Running database in memory, nothing to delete.")
+            return
+        elif database:
+            project_path = Path(database)
+            logger.info(f"Deleting project file: {project_path}.")
+            project_path.unlink()
+            return
+
+    raise RuntimeError(
+        f"Unable to delete project: unsupported engine driver '{engine.driver}'."
+    )
diff --git a/src/aimbat/core/_snapshot.py b/src/aimbat/core/_snapshot.py
index 9c80cd6..9c8e00d 100644
--- a/src/aimbat/core/_snapshot.py
+++ b/src/aimbat/core/_snapshot.py
@@ -120,7 +120,11 @@ def create_snapshot(
         comment: Optional comment.
     """
 
-    logger.info(f"Creating snapshot for event with id={event.id} with {comment=}.")
+    logger.info(
+        f"Creating snapshot for event {event.id}"
+        + (f" with comment '{comment}'" if comment else "")
+        + "."
+    )
 
     event = session.exec(
         select(AimbatEvent)
@@ -332,7 +336,10 @@ def sync_from_matching_hash(
     logger.info(f"Syncing quality metrics from snapshot {snapshot.id}.")
 
     event_quality_snap = snapshot.event_quality_snapshot
-    assert event_quality_snap is not None
+    if event_quality_snap is None:
+        raise ValueError(
+            f"Snapshot {snapshot.id} has no event quality data despite passing filter."
+        )
     live_event_quality = session.get(
         AimbatEventQuality, event_quality_snap.event_quality_id
     )
@@ -424,8 +431,8 @@ def dump_snapshot_table(
 
     Args:
         session: Database session.
-        event_id: Event ID to filter seismograms by (if none is provided,
-            seismograms for all events are dumped).
+        event_id: Event ID to filter snapshots by (if none is provided,
+            snapshots for all events are dumped).
         from_read_model: Whether to dump from the read model (True) or the ORM model.
             Only affects the `snapshots` table.
         by_alias: Whether to use serialization aliases for the field names in the output.
@@ -559,8 +566,8 @@ def dump_event_parameter_snapshot_table(
 
     Args:
         session: Database session.
-        event_id: Event ID to filter seismograms by (if none is provided,
-            seismograms for all events are dumped).
+        event_id: Event ID to filter snapshots by (if none is provided,
+            snapshots for all events are dumped).
         by_alias: Whether to use serialization aliases for the field names in the output.
         exclude: Set of field names to exclude from the output.
     """
@@ -592,8 +599,8 @@ def dump_seismogram_parameter_snapshot_table(
 
     Args:
         session: Database session.
-        event_id: Event ID to filter seismograms by (if none is provided,
-            seismograms for all events are dumped).
+        event_id: Event ID to filter snapshots by (if none is provided,
+            snapshots for all events are dumped).
         by_alias: Whether to use serialization aliases for the field names in the output.
         exclude: Set of field names to exclude from the output.
     """
diff --git a/src/aimbat/models/_parameters.py b/src/aimbat/models/_parameters.py
index 05f0ae1..003a547 100644
--- a/src/aimbat/models/_parameters.py
+++ b/src/aimbat/models/_parameters.py
@@ -125,7 +125,12 @@ def validate_iccs_context(self, info: ValidationInfo) -> Self:
 
 
 class AimbatSeismogramParametersBase(SQLModel):
-    """Base class defining seismogram-level processing parameters for AIMBAT."""
+    """Base class defining seismogram-level processing parameters for AIMBAT.
+
+    This class serves as a base that is inherited by the actual classes that
+    create the database tables. The attributes correspond exactly to the AIMBAT
+    per-seismogram parameters.
+    """
 
     flip: bool = Field(
         default=False,
diff --git a/src/aimbat/models/_readers.py b/src/aimbat/models/_readers.py
index 739be5e..8f6aa78 100644
--- a/src/aimbat/models/_readers.py
+++ b/src/aimbat/models/_readers.py
@@ -509,7 +509,9 @@ class AimbatSeismogramRead(BaseModel):
     def from_seismogram(
         cls, seismogram: AimbatSeismogram, session: Session | None = None
     ) -> Self:
-        name = (f"{seismogram.station.network}." or "") + seismogram.station.name
+        name = (
+            f"{seismogram.station.network}." if seismogram.station.network else ""
+        ) + seismogram.station.name
 
         short_id = None
         short_event_id = None
diff --git a/src/aimbat/utils/_uuid.py b/src/aimbat/utils/_uuid.py
index c1ccc2c..c7f093f 100644
--- a/src/aimbat/utils/_uuid.py
+++ b/src/aimbat/utils/_uuid.py
@@ -97,7 +97,7 @@ def uuid_shortener[T: AimbatTypes](
         candidate = target_full[:current_length]
         if candidate.endswith("-"):
             current_length += 1
-            candidate = target_full[:current_length]
+            continue
 
         matches = [u for u in relevant_pool if u.startswith(candidate)]
         if len(matches) == 1:
diff --git a/tests/integration/core/test_iccs.py b/tests/integration/core/test_iccs.py
index ba23688..cab842f 100644
--- a/tests/integration/core/test_iccs.py
+++ b/tests/integration/core/test_iccs.py
@@ -3,11 +3,13 @@
 from sqlmodel import Session, select
 
 from aimbat.core import (
+    build_iccs_from_snapshot,
     create_iccs_instance,
+    create_snapshot,
     run_iccs,
     run_mccc,
 )
-from aimbat.models import AimbatEvent, AimbatSeismogramQuality
+from aimbat.models import AimbatEvent, AimbatSeismogramQuality, AimbatSnapshot
 
 
 class TestIccsMcccInterplay:
@@ -155,3 +157,66 @@ def test_run_iccs_t1_change_nulls_all_iccs_cc(
             if s.id in initial_ccs:
                 assert s.quality is not None
                 assert s.quality.iccs_cc is None
+
+
+class TestBuildIccsFromSnapshot:
+    """Tests for building an ICCS instance from a snapshot."""
+
+    def test_uses_snapshot_event_parameters(self, loaded_session: Session) -> None:
+        """Verifies that the ICCS built from a snapshot uses the snapshot's
+        event parameters, not the live ones changed after the snapshot was taken.
+
+        Args:
+            loaded_session: The database session with data loaded.
+        """
+        from pandas import Timedelta
+
+        event = loaded_session.exec(select(AimbatEvent)).first()
+        assert event is not None
+
+        original_window_pre = event.parameters.window_pre
+
+        # Take a snapshot that captures the original window_pre
+        create_snapshot(loaded_session, event)
+        snapshot = loaded_session.exec(select(AimbatSnapshot)).one()
+
+        # Shrink window_pre in the live DB after the snapshot was taken
+        event.parameters.window_pre = original_window_pre - Timedelta(seconds=1)
+        loaded_session.add(event.parameters)
+        loaded_session.commit()
+        loaded_session.refresh(event)
+        assert event.parameters.window_pre != original_window_pre
+
+        # Build ICCS from snapshot — must use the original value, not the live one
+        bound = build_iccs_from_snapshot(loaded_session, snapshot.id)
+        assert bound.iccs.window_pre == original_window_pre
+
+    def test_uses_snapshot_seismogram_parameters(self, loaded_session: Session) -> None:
+        """Verifies that the ICCS built from a snapshot uses the per-seismogram
+        parameters captured at snapshot time, not any changes made afterwards.
+
+        Args:
+            loaded_session: The database session with data loaded.
+        """
+        event = loaded_session.exec(select(AimbatEvent)).first()
+        assert event is not None
+
+        seis = event.seismograms[0]
+        original_select = seis.parameters.select
+
+        # Take a snapshot that captures the original select flag
+        create_snapshot(loaded_session, event)
+        snapshot = loaded_session.exec(select(AimbatSnapshot)).one()
+
+        # Toggle select in the live DB after the snapshot was taken
+        seis.parameters.select = not original_select
+        loaded_session.add(seis.parameters)
+        loaded_session.commit()
+        loaded_session.refresh(event)
+
+        # Build ICCS from snapshot — must use the original select flag
+        bound = build_iccs_from_snapshot(loaded_session, snapshot.id)
+        snapshot_seis = next(
+            s for s in bound.iccs.seismograms if s.extra["id"] == seis.id
+        )
+        assert snapshot_seis.select == original_select
diff --git a/tests/integration/core/test_snapshots.py b/tests/integration/core/test_snapshots.py
index bbe094d..383bc80 100644
--- a/tests/integration/core/test_snapshots.py
+++ b/tests/integration/core/test_snapshots.py
@@ -579,6 +579,70 @@ def test_sync_no_match(self, loaded_session: Session) -> None:
             is False
         )
 
+    def test_sync_prefers_specified_snapshot_id_over_most_recent(
+        self, loaded_session: Session
+    ) -> None:
+        """Verifies that sync_from_matching_hash prefers the snapshot whose ID
+        is given as a tie-breaker, even when a more recent candidate exists.
+
+        Args:
+            loaded_session: The database session with data loaded.
+        """
+        event = loaded_session.exec(select(AimbatEvent)).first()
+        assert event is not None
+
+        seis_ids = [s.id for s in event.seismograms]
+        select_flags = [s.select for s in event.seismograms]
+
+        # Write MCCC quality (RMSE = 1 ms) and take first snapshot
+        _write_mock_mccc_quality(
+            loaded_session, event.id, seis_ids, select_flags, all_seismograms=True
+        )
+        loaded_session.refresh(event)
+        eq = loaded_session.exec(
+            select(AimbatEventQuality).where(
+                col(AimbatEventQuality.event_id) == event.id
+            )
+        ).one()
+        eq.mccc_rmse = pd.Timedelta(milliseconds=1)
+        loaded_session.add(eq)
+        loaded_session.commit()
+
+        create_snapshot(loaded_session, event)
+        snapshot1 = loaded_session.exec(select(AimbatSnapshot)).one()
+        parameters_hash = compute_parameters_hash(event)
+
+        # Change RMSE to 2 ms (no parameter change) and take a second snapshot
+        loaded_session.refresh(eq)
+        eq.mccc_rmse = pd.Timedelta(milliseconds=2)
+        loaded_session.add(eq)
+        loaded_session.commit()
+        loaded_session.refresh(event)
+        create_snapshot(loaded_session, event)
+
+        # Clear live RMSE
+        loaded_session.refresh(eq)
+        eq.mccc_rmse = None
+        loaded_session.add(eq)
+        loaded_session.commit()
+
+        # Without a snapshot_id the most recent candidate wins (snapshot2, RMSE=2 ms)
+        sync_from_matching_hash(loaded_session, parameters_hash=parameters_hash)
+        loaded_session.refresh(eq)
+        assert eq.mccc_rmse == pd.Timedelta(milliseconds=2)
+
+        # With snapshot_id=snapshot1.id the older candidate is preferred (RMSE=1 ms)
+        eq.mccc_rmse = None
+        loaded_session.add(eq)
+        loaded_session.commit()
+        sync_from_matching_hash(
+            loaded_session,
+            parameters_hash=parameters_hash,
+            snapshot_id=snapshot1.id,
+        )
+        loaded_session.refresh(eq)
+        assert eq.mccc_rmse == pd.Timedelta(milliseconds=1)
+
 
 class TestDumpSnapshotTable:
     """Tests for dump_snapshot_table."""
diff --git a/tests/integration/models/test_note.py b/tests/integration/models/test_note.py
index 8e3231c..1fb681d 100644
--- a/tests/integration/models/test_note.py
+++ b/tests/integration/models/test_note.py
@@ -1,4 +1,4 @@
-"""Integration tests for the AimbatNote model's single-parent constraint."""
+"""Integration tests for the AimbatNote model's single-parent constraint and core note functions."""
 
 import uuid
 from datetime import timezone
@@ -9,6 +9,7 @@
 from sqlalchemy.exc import IntegrityError
 from sqlmodel import Session
 
+from aimbat.core import get_note_content, save_note
 from aimbat.models import AimbatEvent, AimbatEventParameters, AimbatNote, AimbatStation
 
 
@@ -86,3 +87,45 @@ def test_db_constraint_rejects_two_parents(self, patched_session: Session) -> No
         patched_session.add(note)
         with pytest.raises(IntegrityError):
             patched_session.flush()
+
+
+class TestNoteCore:
+    """Tests for get_note_content and save_note at the core layer."""
+
+    def test_get_note_content_returns_empty_string_when_no_note_exists(
+        self, patched_session: Session
+    ) -> None:
+        """Verifies that get_note_content returns an empty string when no note exists.
+
+        Args:
+            patched_session: The database session.
+        """
+        result = get_note_content(patched_session, "event", uuid.uuid4())
+        assert result == ""
+
+    def test_save_note_creates_note_when_none_exists(
+        self, patched_session: Session
+    ) -> None:
+        """Verifies that save_note creates a new note record when one does not yet exist.
+
+        Args:
+            patched_session: The database session.
+        """
+        ev = _make_event(patched_session)
+        assert get_note_content(patched_session, "event", ev.id) == ""
+
+        save_note(patched_session, "event", ev.id, "initial content")
+
+        assert get_note_content(patched_session, "event", ev.id) == "initial content"
+
+    def test_save_note_updates_existing_note(self, patched_session: Session) -> None:
+        """Verifies that save_note updates the content of an existing note.
+
+        Args:
+            patched_session: The database session.
+        """
+        ev = _make_event(patched_session)
+        save_note(patched_session, "event", ev.id, "first version")
+        save_note(patched_session, "event", ev.id, "second version")
+
+        assert get_note_content(patched_session, "event", ev.id) == "second version"
diff --git a/uv.lock b/uv.lock
index 8852b63..e2f1ef3 100644
--- a/uv.lock
+++ b/uv.lock
@@ -710,11 +710,11 @@ wheels = [
 
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+version = "2.0.2"
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+    { url = "https://files.pythonhosted.org/packages/11/8c/c9138d881c79aa0ea9ed83cbd58d5ca75624378b38cee225dcf5c42cc91f/griffelib-2.0.2-py3-none-any.whl", hash = "sha256:925c857658fb1ba40c0772c37acbc2ab650bd794d9c1b9726922e36ea4117ea1", size = 142357, upload-time = "2026-03-27T11:34:46.275Z" },
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 [[package]]
@@ -1925,8 +1925,8 @@ wheels = [
 
 [[package]]
 name = "pysmo"
-version = "1.0.0.dev42+g39ff86acb"
-source = { git = "https://github.com/pysmo/pysmo?rev=master#39ff86acbf51fa93c4e0b2628c7206ed34c08bc2" }
+version = "1.0.0.dev43+gbca634e0d"
+source = { git = "https://github.com/pysmo/pysmo?rev=master#bca634e0d083d04fa85cdf6eac63fea7f8c8ae18" }
 dependencies = [
     { name = "annotated-types" },
     { name = "attrs" },
@@ -1983,7 +1983,7 @@ sdist = { url = "https://files.pythonhosted.org/packages/c2/ea/84509533e0f647796
 
 [[package]]
 name = "pytest-mpl"
-version = "0.18.0"
+version = "0.19.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jinja2" },
@@ -1992,9 +1992,9 @@ dependencies = [
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 ]
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