diff --git a/week_2/workspaces/resources.py b/week_2/workspaces/resources.py
index 2c2cba81..38172a29 100644
--- a/week_2/workspaces/resources.py
+++ b/week_2/workspaces/resources.py
@@ -23,7 +23,7 @@ def uri(self):
         return f"postgresql://{self.user}:{self.password}@{self.host}/{self.database}"
 
     def execute_query(self, query: str):
-        self._engine.execute(query)
+        return self._engine.execute(query)
 
 
 class S3:
diff --git a/week_3/workspaces/challenge/week_3_challenge.py b/week_3/workspaces/challenge/week_3_challenge.py
index 3be63e5c..35ecd703 100644
--- a/week_3/workspaces/challenge/week_3_challenge.py
+++ b/week_3/workspaces/challenge/week_3_challenge.py
@@ -13,7 +13,7 @@ def load_input(self, context):
         pass
 
 
-@io_manager(required_resource_keys={"postgres"})
+@io_manager(required_resource_keys={"database"})
 def postgres_io_manager(init_context):
     return PostgresIOManager()
 
diff --git a/week_3/workspaces/project/week_3.py b/week_3/workspaces/project/week_3.py
index 68e1f11b..c88c3c6f 100644
--- a/week_3/workspaces/project/week_3.py
+++ b/week_3/workspaces/project/week_3.py
@@ -62,7 +62,7 @@ def week_3_pipeline():
                 "bucket": "dagster",
                 "access_key": "test",
                 "secret_key": "test",
-                "endpoint_url": "http://localstack:4566",
+                "endpoint_url": "http://localhost:4566",
             }
         },
         "redis": {
diff --git a/week_3/workspaces/resources.py b/week_3/workspaces/resources.py
index 28b548f5..192428b9 100644
--- a/week_3/workspaces/resources.py
+++ b/week_3/workspaces/resources.py
@@ -24,7 +24,7 @@ def uri(self):
         return f"postgresql://{self.user}:{self.password}@{self.host}/{self.database}"
 
     def execute_query(self, query: str):
-        self._engine.execute(query)
+        return self._engine.execute(query)
 
 
 class S3:
diff --git a/week_4/workspaces/challenge/repo.py b/week_4/workspaces/challenge/repo.py
index d09ac407..88d67ceb 100644
--- a/week_4/workspaces/challenge/repo.py
+++ b/week_4/workspaces/challenge/repo.py
@@ -4,7 +4,7 @@
     create_dbt_table,
     dbt_assets,
     end,
-    insert_dbt_data,
+    dbt_table,
 )
 from workspaces.dbt_config import DBT_PROJECT_PATH
 from workspaces.resources import postgres_resource
@@ -13,7 +13,7 @@
 @repository
 def repo():
     return with_resources(
-        dbt_assets + [create_dbt_table, insert_dbt_data, end],
+        dbt_assets + [create_dbt_table, dbt_table, end],
         resource_defs={
             "dbt": dbt_cli_resource.configured(
                 {
diff --git a/week_4/workspaces/challenge/week_4_challenge.py b/week_4/workspaces/challenge/week_4_challenge.py
index 8b499b48..326b829c 100644
--- a/week_4/workspaces/challenge/week_4_challenge.py
+++ b/week_4/workspaces/challenge/week_4_challenge.py
@@ -10,6 +10,7 @@
 @asset(
     required_resource_keys={"database"},
     op_tags={"kind": "postgres"},
+    key_prefix=["postgresql"],
 )
 def create_dbt_table(context):
     sql = "CREATE SCHEMA IF NOT EXISTS analytics;"
@@ -21,8 +22,9 @@ def create_dbt_table(context):
 @asset(
     required_resource_keys={"database"},
     op_tags={"kind": "postgres"},
+    key_prefix=["postgresql"],
 )
-def insert_dbt_data(context, create_dbt_table):
+def dbt_table(context, create_dbt_table):
     sql = f"INSERT INTO {SOURCE_TABLE} (column_1, column_2, column_3) VALUES ('A', 'B', 'C');"
 
     number_of_rows = randint(1, 10)
@@ -31,3 +33,8 @@ def insert_dbt_data(context, create_dbt_table):
         context.log.info("Inserted a row")
 
     context.log.info("Batch inserted")
+
+
+@asset
+def end(context):
+    pass
\ No newline at end of file
diff --git a/week_4/workspaces/dbt_config.py b/week_4/workspaces/dbt_config.py
index 77efd7f2..38f66810 100644
--- a/week_4/workspaces/dbt_config.py
+++ b/week_4/workspaces/dbt_config.py
@@ -1 +1 @@
-DBT_PROJECT_PATH = "/opt/dagster/dagster_home/project/dbt_test_project"
+DBT_PROJECT_PATH = "/opt/dagster/dagster_home/dbt_test_project"
diff --git a/week_4/workspaces/resources.py b/week_4/workspaces/resources.py
index 54a578da..39696f9e 100644
--- a/week_4/workspaces/resources.py
+++ b/week_4/workspaces/resources.py
@@ -23,7 +23,7 @@ def uri(self):
         return f"postgresql://{self.user}:{self.password}@{self.host}/{self.database}"
 
     def execute_query(self, query: str):
-        self._engine.execute(query)
+        return self._engine.execute(query)
 
 
 class S3: