How to properly handle/distinguish between errors

  /**
   *
   * @param targetID  the ID of the user to receive the friend request
   */
  async sendUserFriendRequest(targetID: string): Promise<boolean> {
    try {
      await db
        .insert(friends)
        .values({
          user1_ID: this.userID,
          user2_ID: targetID,
          status: "pending",
        })
        .onConflictDoNothing({ target: [friends.user1_ID, friends.user2_ID] });

      log("social").debug(
        `user ${this.userID} sent friend request to user ${targetID}`,
      );
    } catch (e) {
      // if e is caused by targetID user not existing
      // return false
      // else
      log("social").error(
        `user '${this.userID}' failed to send friend request to user '${targetID}' %o`,
        e,
      );
      return false;
    }

    return true;
  }

{
[message]: 'insert or update on table "friends" violates foreign key constraint "friends_user2_user_id_fk"',
  length: 256,
  name: 'error',
  severity: 'ERROR',
  code: '23503',
  detail: 'Key (user2)=(hi) is not present in table "user".',
  hint: undefined,
  position: undefined,
  internalPosition: undefined,
  internalQuery: undefined,
  where: undefined,
  schema: 'public',
  table: 'friends',
  column: undefined,
  dataType: undefined,
  constraint: 'friends_user2_user_id_fk',
  file: 'ri_triggers.c',
  line: '2619',
  routine: 'ri_ReportViolation'
}