feat: add_training_event with subcategory (#79)

* InsertTrainingEvent method #78

* removed unused imports

* fixed type errors

* added type def to event_rows

* fixed .append() call syntax

* made requested changes regarding id formatting

* fixed Ruff CI errors

src/apiserver/data/api/trainings.py

@@ -0,0 +1,32 @@
+from datetime import date
+from schema.model.model import C_EVENTS_CATEGORY, C_EVENTS_DATE, C_EVENTS_DESCRIPTION, C_EVENTS_ID, CLASS_EVENTS_TABLE, CLASS_ID
+from sqlalchemy.ext.asyncio import AsyncConnection
+from store.db import LiteralDict, insert_many
+
+async def add_training_event(
+    conn: AsyncConnection,
+    classification_id: int,
+    categories: list[str],
+    event_date: date,
+    description: str = "",
+) -> list[str]:
+    """breaks up a training into their subcategories and insert them into the class_events table.
+    event_id will be created in the form of: "training[yyyy/dd/mm][category]"
+    we make the assumption that there are no two trainings in a day"""
+    idList = []
+    event_rows: list[LiteralDict] = []
+    for subCategory in categories:
+        subEventId = f'training{event_date.isoformat()}{subCategory}'
+        idList.append(subEventId)
+
+        event_row: LiteralDict = {
+            C_EVENTS_ID: subEventId,
+            CLASS_ID: classification_id,
+            C_EVENTS_CATEGORY: subCategory,
+            C_EVENTS_DATE: event_date,
+            C_EVENTS_DESCRIPTION: description,
+        }
+        event_rows.append(event_row)
+    await insert_many(conn, CLASS_EVENTS_TABLE, event_rows)
+
+    return idList