Add getByTaskId() and getByDbId() methods.

`getByTaskId()` takes an array of strings. It is parsed into task prefix (e.g.
"TA") and task_id. The database is then queried on an array of task_ids.
The result is wrapped in an object with a status code. Currently, the
code is hardcoded as "ok", but can be fleshed out when additional
features are implemented.

There are a few features missing:
- Validation that each string is the right length
- Validation that syntactically valid prefixes and ids were passed
- A check that all requested records are returned
- A check that task prefixes actually exist in the config (requires
  implementing the config module)
- Proper status codes

`getByDbId()` takes and array of id numbers. The database is then
queried with this array. The results are wrapped as above.

Missing features:
- A check that all requested records are returned
- Proper status codes

Both methods return `{status: "failed", error}` when the database
request throws an error.

src/lib/server/services/tasks.ts

@@ -1,5 +1,6 @@
 import { type DB, db } from "$lib/server/db/db";
 import logger from "../logger";
+
 class TasksService {
   private db: DB;
   private caller: "internal" | "api";
@@ -24,6 +25,47 @@ class TasksService {
       return false as const;
     }
   }
+
+  public async getByTaskId(taskIds: Array<string>) {
+    const mappedTasks = taskIds.map(x => {
+      const prefix = x.slice(0, 2);
+      const task_id = x.slice(2);
+      return { prefix, task_id };
+    });
+    logger.info(
+      `Fetching ${
+        taskIds.length === 0
+          ? "0 records"
+          : taskIds.length < 10
+          ? taskIds.join(", ")
+          : `${taskIds.length} records`
+      }.`,
+    );
+    try {
+      const tasks = await db.query.tasks.findMany({
+        with: { type: true },
+        where: (tasks, { inArray }) => inArray(tasks.taskId, mappedTasks.map(x => x.task_id)),
+      });
+      return { tasks, status: "ok" };
+    } catch (error) {
+      logger.error({ msg: "Error querying the database.", error });
+      return { status: "failed", error };
+    }
+  }
+
+  public async getByDbId(ids: Array<number>) {
+    logger.info(`Fetching ${ids.length} records.`);
+    try {
+      const tasks = await db.query.tasks.findMany({
+        with: { type: true },
+        where: (tasks, { inArray }) => inArray(tasks.id, ids),
+      });
+      return { tasks, status: "ok" };
+    } catch (error) {
+      logger.error({ msg: "Error querying the database.", error });
+      return { status: "failed", error };
+    }
+  }
 }
 
 export default TasksService;