fix(inference): respect table_name config in InferenceStore (backport #4371) (#4372)

# What does this PR do?

The InferenceStore class was ignoring the table_name field from
InferenceStoreReference and always using the hardcoded value
"chat_completions". This meant that any custom table_name configured in
the run config (e.g., "inference_store" in run-with-postgres-store.yaml)
was silently ignored.

This change updates all SQL operations in InferenceStore to use
self.reference.table_name instead of the hardcoded string, ensuring the
configured table name is properly respected.

A new test has been added to verify that custom table names work
correctly for storing, retrieving, and listing chat completions.




## Test Plan

CI

<hr>This is an automatic backport of pull request #4371 done by
[Mergify](https://mergify.com).

Signed-off-by: Sébastien Han <seb@redhat.com>
Co-authored-by: Sébastien Han <seb@redhat.com>

llama_stack/providers/utils/inference/inference_store.py

@@ -56,7 +56,7 @@ class InferenceStore:
             logger.debug("Write queue disabled for SQLite (WAL mode handles concurrency)")
 
         await self.sql_store.create_table(
-            "chat_completions",
+            self.reference.table_name,
             {
                 "id": ColumnDefinition(type=ColumnType.STRING, primary_key=True),
                 "created": ColumnType.INTEGER,
@@ -161,7 +161,7 @@ class InferenceStore:
 
         try:
             await self.sql_store.insert(
-                table="chat_completions",
+                table=self.reference.table_name,
                 data=record_data,
             )
         except IntegrityError as e:
@@ -173,7 +173,7 @@ class InferenceStore:
             error_message = str(e.orig) if e.orig else str(e)
             if self._is_unique_constraint_error(error_message):
                 # Update the existing record instead
-                await self.sql_store.update(table="chat_completions", data=record_data, where={"id": data["id"]})
+                await self.sql_store.update(table=self.reference.table_name, data=record_data, where={"id": data["id"]})
             else:
                 # Re-raise if it's not a unique constraint error
                 raise
@@ -217,7 +217,7 @@ class InferenceStore:
             where_conditions["model"] = model
 
         paginated_result = await self.sql_store.fetch_all(
-            table="chat_completions",
+            table=self.reference.table_name,
             where=where_conditions if where_conditions else None,
             order_by=[("created", order.value)],
             cursor=("id", after) if after else None,
@@ -246,7 +246,7 @@ class InferenceStore:
             raise ValueError("Inference store is not initialized")
 
         row = await self.sql_store.fetch_one(
-            table="chat_completions",
+            table=self.reference.table_name,
             where={"id": completion_id},
         )
 

tests/unit/utils/inference/test_inference_store.py

@@ -210,3 +210,32 @@ async def test_inference_store_pagination_no_limit():
     assert result.data[0].id == "beta-second"  # Most recent first
     assert result.data[1].id == "omega-first"
     assert result.has_more is False
+
+
+async def test_inference_store_custom_table_name():
+    """Test that the table_name from config is respected."""
+    custom_table_name = "custom_inference_store"
+    reference = InferenceStoreReference(backend="sql_default", table_name=custom_table_name)
+    store = InferenceStore(reference, policy=[])
+    await store.initialize()
+
+    # Create and store a test chat completion
+    base_time = int(time.time())
+    completion = create_test_chat_completion("custom-table-test", base_time)
+    input_messages = [OpenAIUserMessageParam(role="user", content="Test custom table")]
+    await store.store_chat_completion(completion, input_messages)
+    await store.flush()
+
+    # Verify we can retrieve the completion
+    result = await store.get_chat_completion("custom-table-test")
+    assert result.id == "custom-table-test"
+    assert result.model == "test-model"
+
+    # Verify listing works
+    list_result = await store.list_chat_completions()
+    assert len(list_result.data) == 1
+    assert list_result.data[0].id == "custom-table-test"
+
+    # Verify the error message uses the custom table name
+    with pytest.raises(ValueError, match=f"Record with id='non-existent' not found in table '{custom_table_name}'"):
+        await store.list_chat_completions(after="non-existent", limit=2)