diff --git a/back/boxtribute_server/graph_ql/execution.py b/back/boxtribute_server/graph_ql/execution.py
index 5fe7c52e3e..f05dae60a2 100644
--- a/back/boxtribute_server/graph_ql/execution.py
+++ b/back/boxtribute_server/graph_ql/execution.py
@@ -4,6 +4,7 @@
 from flask import current_app, jsonify, request
 
 from ..exceptions import format_database_errors
+from ..utils import activate_logging
 from .loaders import (
     BaseLoader,
     BoxLoader,
@@ -33,6 +34,7 @@ def execute_async(*, schema, introspection=None):
     managing the asyncio event loop, finalizing asynchronous generators, and closing
     the threadpool.
     """
+    logger = activate_logging()
 
     async def run():
         # Create DataLoaders and persist them for the time of processing the request.
@@ -73,5 +75,6 @@ async def run():
 
     success, result = asyncio.run(run())
 
+    logger.warning("done")
     status_code = 200 if success else 400
     return jsonify(result), status_code
diff --git a/back/boxtribute_server/graph_ql/loaders.py b/back/boxtribute_server/graph_ql/loaders.py
index b8f7f5e938..99929587b7 100644
--- a/back/boxtribute_server/graph_ql/loaders.py
+++ b/back/boxtribute_server/graph_ql/loaders.py
@@ -1,4 +1,6 @@
+import asyncio
 from collections import defaultdict
+from concurrent.futures import ThreadPoolExecutor
 from datetime import datetime
 from functools import partial
 
@@ -38,6 +40,27 @@ def load(self, key):
         return super().load(key)
 
 
+executor = ThreadPoolExecutor(max_workers=5)
+
+
+async def select(
+    model, /, *conditions, fields=None, join_kwargs=None, group_field=None
+):
+    def utility_function():
+        query = model.select()
+        if fields is not None:
+            query = model.select(*fields)
+        if join_kwargs is not None:
+            query = query.join(**join_kwargs)
+        if conditions:
+            query = query.where(*conditions)
+        if group_field is not None:
+            query = query.group_by(group_field)
+        return list(query.iterator())
+
+    return await asyncio.get_running_loop().run_in_executor(executor, utility_function)
+
+
 class SimpleDataLoader(DataLoader):
     """Custom implementation that batch-loads all requested rows of the specified data
     model, optionally enforcing authorization for the resource.
@@ -55,7 +78,7 @@ async def batch_load_fn(self, ids):
             permission = f"{resource}:read"
             authorize(permission=permission)
 
-        rows = {r.id: r for r in self.model.select().where(self.model.id << ids)}
+        rows = {r.id: r for r in await select(self.model, self.model.id << ids)}
         return [rows.get(i) for i in ids]
 
 
@@ -118,9 +141,12 @@ class ShipmentLoader(DataLoader):
     async def batch_load_fn(self, keys):
         shipments = {
             s.id: s
-            for s in Shipment.select().orwhere(
-                authorized_bases_filter(Shipment, base_fk_field_name="source_base_id"),
-                authorized_bases_filter(Shipment, base_fk_field_name="target_base_id"),
+            for s in await select(
+                Shipment,
+                authorized_bases_filter(Shipment, base_fk_field_name="source_base_id")
+                | authorized_bases_filter(
+                    Shipment, base_fk_field_name="target_base_id"
+                ),
             )
         }
         return [shipments.get(i) for i in keys]
@@ -131,7 +157,8 @@ async def batch_load_fn(self, agreement_ids):
         # Select all shipments with given agreement IDs that the user is authorized for,
         # and group them by agreement ID
         shipments = defaultdict(list)
-        for shipment in Shipment.select().where(
+        for shipment in await select(
+            Shipment,
             Shipment.transfer_agreement << agreement_ids,
             authorized_bases_filter(Shipment, base_fk_field_name="source_base")
             | authorized_bases_filter(Shipment, base_fk_field_name="target_base"),
@@ -145,16 +172,18 @@ class TagsForBoxLoader(DataLoader):
     async def batch_load_fn(self, keys):
         tags = defaultdict(list)
         # maybe need different join type
-        for relation in TagsRelation.select(
-            TagsRelation.object_type, TagsRelation.object_id, Tag
-        ).join(
-            Tag,
-            on=(
-                (TagsRelation.tag == Tag.id)
-                & (TagsRelation.object_type == TaggableObjectType.Box)
-                & (TagsRelation.object_id << keys)
-                & (TagsRelation.deleted_on.is_null())
-                & (authorized_bases_filter(Tag))
+        for relation in await select(
+            TagsRelation,
+            fields=(TagsRelation.object_type, TagsRelation.object_id, Tag),
+            join_kwargs=dict(
+                dest=Tag,
+                on=(
+                    (TagsRelation.tag == Tag.id)
+                    & (TagsRelation.object_type == TaggableObjectType.Box)
+                    & (TagsRelation.object_id << keys)
+                    & (TagsRelation.deleted_on.is_null())
+                    & (authorized_bases_filter(Tag))
+                ),
             ),
         ):
             tags[relation.object_id].append(relation.tag)
@@ -462,10 +491,11 @@ async def batch_load_fn(self, shipment_ids):
         # Join with Shipment model, such that authorization in ShipmentDetail resolvers
         # (detail.shipment.source_base_id) don't create additional DB queries
         details = defaultdict(list)
-        for detail in (
-            ShipmentDetail.select(ShipmentDetail, Shipment)
-            .join(Shipment)
-            .where(ShipmentDetail.shipment << shipment_ids)
+        for detail in await select(
+            ShipmentDetail,
+            ShipmentDetail.shipment << shipment_ids,
+            fields=[ShipmentDetail, Shipment],
+            join_kwargs={"dest": Shipment},
         ):
             details[detail.shipment_id].append(detail)
         # Return empty list if shipment has no details attached
@@ -476,7 +506,8 @@ class ShipmentDetailForBoxLoader(DataLoader):
     async def batch_load_fn(self, keys):
         details = {
             detail.box_id: detail
-            for detail in ShipmentDetail.select().where(
+            for detail in await select(
+                ShipmentDetail,
                 ShipmentDetail.box << keys,
                 ShipmentDetail.removed_on.is_null(),
                 ShipmentDetail.lost_on.is_null(),
@@ -492,7 +523,7 @@ async def batch_load_fn(self, keys):
         authorize(permission="size:read")
         # Mapping of size range ID to list of sizes
         sizes = defaultdict(list)
-        for size in Size.select():
+        for size in await select(Size):
             sizes[size.size_range_id].append(size)
         # Keys are in fact size range IDs. Return empty list if size range has no sizes
         return [sizes.get(i, []) for i in keys]
@@ -502,23 +533,26 @@ class UnitsForDimensionLoader(DataLoader):
     async def batch_load_fn(self, keys):
         # Mapping of size range ID (dimension) to list of units
         units = defaultdict(list)
-        for unit in Unit.select().iterator():
+        for unit in await select(Unit):
             units[unit.dimension_id].append(unit)
         return [units.get(i, []) for i in keys]
 
 
 class EnabledBasesForStandardProductLoader(DataLoader):
     async def batch_load_fn(self, standard_product_ids):
-        result = Product.select(Product.standard_product, Base).join(
-            Base,
-            on=(
-                (Product.base == Base.id)
-                & authorized_bases_filter(model=Product)
-                & (Product.standard_product << standard_product_ids)
-                & (Product.deleted_on.is_null())
-            ),
-        )
         standard_products = defaultdict(list)
-        for row in result:
+        for row in await select(
+            Product,
+            fields=(Product.standard_product, Base),
+            join_kwargs=dict(
+                dest=Base,
+                on=(
+                    (Product.base == Base.id)
+                    & authorized_bases_filter(model=Product)
+                    & (Product.standard_product << standard_product_ids)
+                    & (Product.deleted_on.is_null())
+                ),
+            ),
+        ):
             standard_products[row.standard_product_id].append(row.base)
         return [standard_products.get(i, []) for i in standard_product_ids]
diff --git a/back/boxtribute_server/utils.py b/back/boxtribute_server/utils.py
index 38943d409e..4e1052ef1f 100644
--- a/back/boxtribute_server/utils.py
+++ b/back/boxtribute_server/utils.py
@@ -52,3 +52,9 @@ def activate_logging():  # pragma: no cover
         from flask import current_app
 
         logger.parent = current_app.logger
+        handler = logging.FileHandler("back/peewee.log")
+        formatter = logging.Formatter("%(created)f | %(message)s")
+        handler.setFormatter(formatter)
+        if len(logger.handlers) == 1:
+            logger.addHandler(handler)
+    return logger