diff --git a/dagster_home/dagster.yaml b/dagster_home/dagster.yaml
index 9e2ce04..4c8535b 100644
--- a/dagster_home/dagster.yaml
+++ b/dagster_home/dagster.yaml
@@ -4,3 +4,12 @@ storage:
   postgres:
     postgres_url:
       env: DAGSTER_POSTGRES_URL
+    pool_size: 5
+    max_overflow: 5
+
+# Limit concurrent runs to avoid overwhelming the VM and database.
+concurrency:
+  default_op_concurrency_limit: 1
+
+run_queue:
+  max_concurrent_runs: 1
diff --git a/data_platform/assets/ingestion/funda/funda.py b/data_platform/assets/ingestion/funda/funda.py
index abf46ff..841ad45 100644
--- a/data_platform/assets/ingestion/funda/funda.py
+++ b/data_platform/assets/ingestion/funda/funda.py
@@ -1,6 +1,7 @@
 """Funda real-estate ingestion assets."""
 
 import json
+import time
 from pathlib import Path
 
 from dagster import (
@@ -10,6 +11,7 @@ from dagster import (
     MetadataValue,
     asset,
 )
+from funda import Listing
 from sqlalchemy import text
 
 from data_platform.helpers import (
@@ -94,14 +96,14 @@ def raw_funda_search_results(
 
     all_listings = []
     for page in range(config.max_pages):
-        context.log.info(f"Fetching search page {page + 1}/{config.max_pages} …")
+        context.log.info(f"Fetching search page {page + 1}/{config.max_pages}...")
         kwargs["page"] = page
         results = client.search_listing(**kwargs)
         if not results:
             context.log.info("No more results.")
             break
         all_listings.extend(results)
-        context.log.info(f"  got {len(results)} listings (total: {len(all_listings)})")
+        context.log.info(f"Got {len(results)} listings (total: {len(all_listings)}).")
 
     if not all_listings:
         context.log.warning("Search returned zero results.")
@@ -109,7 +111,9 @@ def raw_funda_search_results(
 
     engine = postgres.get_engine()
     with engine.begin() as conn:
-        conn.execute(text(f"CREATE SCHEMA IF NOT EXISTS {_SCHEMA}"))
+        conn.execute(
+            text(render_sql(_SQL_DIR, "ddl/create_schema.sql", schema=_SCHEMA))
+        )
         conn.execute(
             text(render_sql(_SQL_DIR, "ddl/create_search_results.sql", schema=_SCHEMA))
         )
@@ -150,10 +154,11 @@ def raw_funda_search_results(
     with engine.begin() as conn:
         result = conn.execute(
             text(
-                f"UPDATE {_SCHEMA}.search_results"
-                f" SET is_active = FALSE"
-                f" WHERE last_seen_at < now() - INTERVAL '7 days'"
-                f" RETURNING global_id"
+                render_sql(
+                    _SQL_DIR,
+                    "dml/mark_inactive_search_results.sql",
+                    schema=_SCHEMA,
+                )
             )
         )
         newly_inactive = result.rowcount
@@ -202,23 +207,21 @@ def raw_funda_listing_details(
     engine = postgres.get_engine()
 
     with engine.begin() as conn:
-        conn.execute(text(f"CREATE SCHEMA IF NOT EXISTS {_SCHEMA}"))
+        conn.execute(
+            text(render_sql(_SQL_DIR, "ddl/create_schema.sql", schema=_SCHEMA))
+        )
         conn.execute(
             text(render_sql(_SQL_DIR, "ddl/create_listing_details.sql", schema=_SCHEMA))
         )
 
     with engine.connect() as conn:
         if config.fetch_all:
-            query = text(f"SELECT DISTINCT global_id FROM {_SCHEMA}.search_results")
+            query = text(
+                render_sql(_SQL_DIR, "dml/select_all_detail_ids.sql", schema=_SCHEMA)
+            )
         else:
             query = text(
-                f"""
-                SELECT DISTINCT s.global_id
-                FROM {_SCHEMA}.search_results s
-                LEFT JOIN {_SCHEMA}.listing_details d ON s.global_id = d.global_id
-                WHERE s.is_active = TRUE
-                  AND (d.global_id IS NULL OR d.is_stale = TRUE)
-                """
+                render_sql(_SQL_DIR, "dml/select_new_detail_ids.sql", schema=_SCHEMA)
             )
         result = conn.execute(query)
         ids = [row[0] for row in result if row[0]]
@@ -227,7 +230,7 @@ def raw_funda_listing_details(
         context.log.warning("No search results found – run funda_search_results first.")
         return MaterializeResult(metadata={"count": 0})
 
-    context.log.info(f"Fetching details for {len(ids)} listings …")
+    context.log.info(f"Fetching details for {len(ids)} listings...")
 
     rows = []
     errors = 0
@@ -282,7 +285,9 @@ def raw_funda_listing_details(
             continue
 
         if (i + 1) % 10 == 0:
-            context.log.info(f"  fetched {i + 1}/{len(ids)} …")
+            context.log.info(f"Fetched {i + 1}/{len(ids)} listings.")
+
+        time.sleep(1)
 
     if rows:
         postgres.execute_many(
@@ -293,14 +298,11 @@ def raw_funda_listing_details(
     with engine.begin() as conn:
         conn.execute(
             text(
-                f"""
-                UPDATE {_SCHEMA}.listing_details d
-                SET is_stale = TRUE
-                FROM {_SCHEMA}.search_results s
-                WHERE d.global_id = s.global_id
-                  AND s.is_active = FALSE
-                  AND d.is_stale = FALSE
-                """
+                render_sql(
+                    _SQL_DIR,
+                    "dml/mark_stale_listing_details.sql",
+                    schema=_SCHEMA,
+                )
             )
         )
 
@@ -345,78 +347,89 @@ def raw_funda_price_history(
     engine = postgres.get_engine()
 
     with engine.begin() as conn:
-        conn.execute(text(f"CREATE SCHEMA IF NOT EXISTS {_SCHEMA}"))
+        conn.execute(
+            text(render_sql(_SQL_DIR, "ddl/create_schema.sql", schema=_SCHEMA))
+        )
         conn.execute(
             text(render_sql(_SQL_DIR, "ddl/create_price_history.sql", schema=_SCHEMA))
         )
 
+    # Fetch listing metadata (url, title, postcode) from the DB so we can call
+    # get_price_history without re-fetching each listing from the Funda API.
     with engine.connect() as conn:
         if config.fetch_all:
-            query = text(f"SELECT DISTINCT global_id FROM {_SCHEMA}.listing_details")
+            query = text(
+                render_sql(
+                    _SQL_DIR,
+                    "dml/select_all_price_history_listings.sql",
+                    schema=_SCHEMA,
+                )
+            )
         else:
             query = text(
-                f"""
-                SELECT DISTINCT d.global_id
-                FROM {_SCHEMA}.listing_details d
-                JOIN {_SCHEMA}.search_results s ON d.global_id = s.global_id
-                WHERE s.is_active = TRUE
-                UNION
-                SELECT DISTINCT d.global_id
-                FROM {_SCHEMA}.listing_details d
-                LEFT JOIN {_SCHEMA}.price_history p ON d.global_id = p.global_id
-                WHERE p.global_id IS NULL
-                """
+                render_sql(
+                    _SQL_DIR,
+                    "dml/select_new_price_history_listings.sql",
+                    schema=_SCHEMA,
+                )
             )
         result = conn.execute(query)
-        ids = [row[0] for row in result if row[0]]
+        listings = [(row[0], row[1], row[2], row[3]) for row in result if row[0]]
 
-    if not ids:
+    if not listings:
         context.log.warning(
             "No listing details found – run funda_listing_details first."
         )
         return MaterializeResult(metadata={"count": 0})
 
-    context.log.info(f"Fetching price history for {len(ids)} listings …")
+    context.log.info(f"Fetching price history for {len(listings)} listings...")
 
-    rows = []
+    batch_size = 25
+    total_rows = 0
     errors = 0
-    for i, gid in enumerate(ids):
+    for i, (gid, url, title, postcode) in enumerate(listings):
         try:
-            listing = client.get_listing(int(gid))
-            history = client.get_price_history(listing)
-            for entry in history:
-                rows.append(
-                    {
-                        "global_id": gid,
-                        "price": safe_int(entry.get("price")),
-                        "human_price": entry.get("human_price"),
-                        "date": entry.get("date"),
-                        "timestamp": entry.get("timestamp"),
-                        "source": entry.get("source"),
-                        "status": entry.get("status"),
-                    }
+            stub = Listing(data={"url": url, "title": title, "postcode": postcode})
+            history = client.get_price_history(stub)
+            rows = [
+                {
+                    "global_id": gid,
+                    "price": safe_int(entry.get("price")),
+                    "human_price": entry.get("human_price"),
+                    "date": entry.get("date"),
+                    "timestamp": entry.get("timestamp"),
+                    "source": entry.get("source"),
+                    "status": entry.get("status"),
+                }
+                for entry in history
+            ]
+            if rows:
+                postgres.execute_many(
+                    render_sql(
+                        _SQL_DIR, "dml/insert_price_history.sql", schema=_SCHEMA
+                    ),
+                    rows,
                 )
+                total_rows += len(rows)
         except Exception as e:
             errors += 1
             context.log.warning(f"Failed to fetch price history for {gid}: {e}")
             continue
 
-        if (i + 1) % 10 == 0:
-            context.log.info(f"  fetched {i + 1}/{len(ids)} …")
+        if (i + 1) % batch_size == 0:
+            context.log.info(f"Fetched {i + 1}/{len(listings)} price histories.")
 
-    if rows:
-        postgres.execute_many(
-            render_sql(_SQL_DIR, "dml/insert_price_history.sql", schema=_SCHEMA), rows
-        )
+        time.sleep(1)
 
     context.log.info(
-        f"Inserted {len(rows)} price history records ({errors} errors) into {_SCHEMA}.price_history"
+        f"Inserted {total_rows} price history records ({errors} errors) "
+        f"into {_SCHEMA}.price_history"
     )
 
     return MaterializeResult(
         metadata={
-            "count": len(rows),
+            "count": total_rows,
             "errors": errors,
-            "listings_processed": len(ids) - errors,
+            "listings_processed": len(listings) - errors,
         }
     )
diff --git a/data_platform/assets/ingestion/funda/sql/ddl/create_schema.sql b/data_platform/assets/ingestion/funda/sql/ddl/create_schema.sql
new file mode 100644
index 0000000..4b3923d
--- /dev/null
+++ b/data_platform/assets/ingestion/funda/sql/ddl/create_schema.sql
@@ -0,0 +1 @@
+create schema if not exists {{ schema }};
diff --git a/data_platform/assets/ingestion/funda/sql/dml/mark_inactive_search_results.sql b/data_platform/assets/ingestion/funda/sql/dml/mark_inactive_search_results.sql
new file mode 100644
index 0000000..f8e88a2
--- /dev/null
+++ b/data_platform/assets/ingestion/funda/sql/dml/mark_inactive_search_results.sql
@@ -0,0 +1,4 @@
+update {{ schema }}.search_results
+set is_active = false
+where last_seen_at < now() - interval '7 days'
+returning global_id
diff --git a/data_platform/assets/ingestion/funda/sql/dml/mark_stale_listing_details.sql b/data_platform/assets/ingestion/funda/sql/dml/mark_stale_listing_details.sql
new file mode 100644
index 0000000..4717fb3
--- /dev/null
+++ b/data_platform/assets/ingestion/funda/sql/dml/mark_stale_listing_details.sql
@@ -0,0 +1,7 @@
+update {{ schema }}.listing_details d
+set is_stale = true
+from {{ schema }}.search_results as s
+where
+    d.global_id = s.global_id
+    and s.is_active = false
+    and d.is_stale = false
diff --git a/data_platform/assets/ingestion/funda/sql/dml/select_all_detail_ids.sql b/data_platform/assets/ingestion/funda/sql/dml/select_all_detail_ids.sql
new file mode 100644
index 0000000..280cbfa
--- /dev/null
+++ b/data_platform/assets/ingestion/funda/sql/dml/select_all_detail_ids.sql
@@ -0,0 +1,2 @@
+select distinct global_id
+from {{ schema }}.search_results
diff --git a/data_platform/assets/ingestion/funda/sql/dml/select_all_price_history_listings.sql b/data_platform/assets/ingestion/funda/sql/dml/select_all_price_history_listings.sql
new file mode 100644
index 0000000..5593de5
--- /dev/null
+++ b/data_platform/assets/ingestion/funda/sql/dml/select_all_price_history_listings.sql
@@ -0,0 +1,6 @@
+select distinct
+    d.global_id,
+    d.url,
+    d.title,
+    d.postcode
+from {{ schema }}.listing_details as d
diff --git a/data_platform/assets/ingestion/funda/sql/dml/select_new_detail_ids.sql b/data_platform/assets/ingestion/funda/sql/dml/select_new_detail_ids.sql
new file mode 100644
index 0000000..bed5a8a
--- /dev/null
+++ b/data_platform/assets/ingestion/funda/sql/dml/select_new_detail_ids.sql
@@ -0,0 +1,6 @@
+select distinct s.global_id
+from {{ schema }}.search_results as s
+left join {{ schema }}.listing_details as d on s.global_id = d.global_id
+where
+    s.is_active = true
+    and (d.global_id is null or d.is_stale = true)
diff --git a/data_platform/assets/ingestion/funda/sql/dml/select_new_price_history_listings.sql b/data_platform/assets/ingestion/funda/sql/dml/select_new_price_history_listings.sql
new file mode 100644
index 0000000..275a823
--- /dev/null
+++ b/data_platform/assets/ingestion/funda/sql/dml/select_new_price_history_listings.sql
@@ -0,0 +1,17 @@
+select distinct
+    d.global_id,
+    d.url,
+    d.title,
+    d.postcode
+from {{ schema }}.listing_details as d
+inner join {{ schema }}.search_results as s on d.global_id = s.global_id
+where s.is_active = true
+union
+select distinct
+    d.global_id,
+    d.url,
+    d.title,
+    d.postcode
+from {{ schema }}.listing_details as d
+left join {{ schema }}.price_history as p on d.global_id = p.global_id
+where p.global_id is null
diff --git a/data_platform/definitions.py b/data_platform/definitions.py
index 6217e8c..ebd6e0e 100644
--- a/data_platform/definitions.py
+++ b/data_platform/definitions.py
@@ -1,4 +1,8 @@
-from dagster import Definitions
+from dagster import (
+    AutomationConditionSensorDefinition,
+    DefaultSensorStatus,
+    Definitions,
+)
 from dagster_dbt import DbtCliResource
 
 from data_platform.assets.dbt import DBT_PROJECT_DIR, dbt_project_assets
@@ -30,6 +34,13 @@ defs = Definitions(
         ]
     ),
     jobs=[funda_ingestion_job, funda_raw_quality_job, elementary_refresh_job],
+    sensors=[
+        AutomationConditionSensorDefinition(
+            name="automation_condition_sensor",
+            target="*",
+            default_status=DefaultSensorStatus.RUNNING,
+        ),
+    ],
     schedules=[
         funda_ingestion_schedule,
         funda_raw_quality_schedule,
diff --git a/data_platform/resources/__init__.py b/data_platform/resources/__init__.py
index bdc00b5..b3a07f4 100644
--- a/data_platform/resources/__init__.py
+++ b/data_platform/resources/__init__.py
@@ -3,6 +3,7 @@
 from dagster import ConfigurableResource, EnvVar
 from funda import Funda
 from sqlalchemy import create_engine, text
+from sqlalchemy.pool import NullPool
 
 
 class FundaResource(ConfigurableResource):
@@ -25,7 +26,7 @@ class PostgresResource(ConfigurableResource):
 
     def get_engine(self):
         url = f"postgresql://{self.user}:{self.password}@{self.host}:{self.port}/{self.dbname}"
-        return create_engine(url)
+        return create_engine(url, poolclass=NullPool)
 
     def execute(self, statement: str, params: dict | None = None):
         engine = self.get_engine()
diff --git a/dbt/models/staging/stg_funda_listings.yml b/dbt/models/staging/stg_funda_listings.yml
index 803f1d0..5bf3a3a 100644
--- a/dbt/models/staging/stg_funda_listings.yml
+++ b/dbt/models/staging/stg_funda_listings.yml
@@ -89,7 +89,7 @@ models:
         data_type: text
         tests:
           - accepted_values:
-              values: ["A3", "A2", "A1", "A", "B", "C", "D", "E", "F", "G"]
+              values: ["A4", "A3", "A2", "A1", "A", "B", "C", "D", "E", "F", "G"]
               where: "energy_label is not null"
       - name: living_area
         description: Interior floor area in m².
diff --git a/tests/test_assets_funda.py b/tests/test_assets_funda.py
index 4254abc..a6c3015 100644
--- a/tests/test_assets_funda.py
+++ b/tests/test_assets_funda.py
@@ -260,9 +260,17 @@ class TestFundaPriceHistory:
         assert mat[0].metadata["count"].value == 0
 
     def test_price_history_inserted(self):
-        engine, _, _ = make_mock_engine(select_rows=[("1234567",)])
+        engine, _, _ = make_mock_engine(
+            select_rows=[
+                (
+                    "1234567",
+                    "https://www.funda.nl/detail/koop/amsterdam/app/87654321/",
+                    "Teststraat 1",
+                    "1234AB",
+                ),
+            ]
+        )
         client = MagicMock()
-        client.get_listing.return_value = make_mock_listing(_DETAIL_LISTING_DATA)
         client.get_price_history.return_value = [
             {
                 "price": 350000,