Add exists method to PlexMovie entity

packages/database/src/entities/PlexMovie.ts

@@ -19,6 +19,13 @@ export class PlexMovie extends BaseEntity
 		return (await PlexMovie.findOne({ where: { tmdbId } }))?.plexKey ?? null;
 	}
 
+	/**
+	 * Check if the given movie exists on Plex
+	 */
+	public static async exists(tmdbId: number|string) {
+		return (await PlexMovie.count({ where: { tmdbId } })) > 0;
+	}
+
 	/**
 	 * Get the set of IMDb IDs stored in the library
 	 */