diff --git a/.github/workflows/cicd.yaml b/.github/workflows/cicd.yaml
index 1748af7..20cb437 100644
--- a/.github/workflows/cicd.yaml
+++ b/.github/workflows/cicd.yaml
@@ -11,7 +11,6 @@ on:
     paths:
       - 'justfile'
       - 'website/**'
-      - '_quarto.yml'
       - 'dev-requirements.txt'
       - '.github/workflows/cicd.yaml'
 
diff --git a/justfile b/justfile
index 5c6eb44..4110346 100644
--- a/justfile
+++ b/justfile
@@ -22,8 +22,7 @@ build:
 
 # setup
 setup:
-    @pip install uv
-    @uv venv
+    @uv venv --python 3.12
     @. .venv/bin/activate
     @uv pip install --upgrade --resolution=highest -r dev-requirements.txt
 
diff --git a/src/icarus/cli.py b/src/icarus/cli.py
index 8cd5236..001f8c5 100644
--- a/src/icarus/cli.py
+++ b/src/icarus/cli.py
@@ -24,7 +24,7 @@
 }
 
 # typer apps
-app = typer.Typer(help="Icarus", **TYPER_KWARGS)
+app = typer.Typer(help="Icarus: soaring beyond limits.", **TYPER_KWARGS)
 clean_app = typer.Typer(help="Clean the data lake.", **TYPER_KWARGS)
 
 # add subcommands
diff --git a/src/icarus/investments/extract.py b/src/icarus/investments/extract.py
index beb102e..165603e 100644
--- a/src/icarus/investments/extract.py
+++ b/src/icarus/investments/extract.py
@@ -11,6 +11,8 @@
 )
 
 # set extracted_at timestamp
+# note we don't use ibis.now() to ensure it's the same...
+# ...for all tables/rows on a given run
 extracted_at = datetime.utcnow().isoformat()
 
 
diff --git a/src/icarus/investments/run.py b/src/icarus/investments/run.py
index c0c4a55..cf275ac 100644
--- a/src/icarus/investments/run.py
+++ b/src/icarus/investments/run.py
@@ -20,10 +20,26 @@ def main():
     extract_buy_sell_t = extract_buy_sell()
     extract_social_media_t = extract_social_media()
 
+    # data validation
+    assert (
+        extract_buy_sell_t.count().to_pyarrow().as_py() > 0
+    ), "No extracted buy/sell data"
+    assert (
+        extract_social_media_t.count().to_pyarrow().as_py() > 0
+    ), "No extracted social media data"
+
     # transform
     transform_buy_sell_t = transform_buy_sell(extract_buy_sell_t)
     transform_social_media_t = transform_social_media(extract_social_media_t)
 
-    # load?
+    # data validation
+    assert (
+        transform_buy_sell_t.count().to_pyarrow().as_py() > 0
+    ), "No transformed buy/sell data"
+    assert (
+        transform_social_media_t.count().to_pyarrow().as_py() > 0
+    ), "No transformed social media data"
+
+    # load
     catalog.write_table(transform_buy_sell_t, BUY_SELL_TABLE)
     catalog.write_table(transform_social_media_t, SOCIAL_MEDIA_TABLE)