feat(housekeeping): complete people moderation parity

src/lib/services/ticket-replies.ts

@@ -19,6 +19,28 @@ export interface TicketReplyDb {
 	touchTicket(ticketId: bigint, updatedAt: Date): Promise<unknown>;
 }
 
+const MAX_UNSIGNED_BIGINT = 18_446_744_073_709_551_615n;
+
+// Canonicalize a SQL BIGINT identifier without passing through Number.
+export function canonicalTicketId(value: string | number | bigint): bigint {
+	let parsed: bigint;
+	try {
+		if (
+			typeof value === "number" &&
+			(!Number.isSafeInteger(value) || value <= 0)
+		) {
+			throw new Error("unsafe identifier");
+		}
+		parsed = BigInt(String(value));
+	} catch {
+		throw new Error("invalid ticket identifier");
+	}
+	if (parsed <= 0n || parsed > MAX_UNSIGNED_BIGINT) {
+		throw new Error("invalid ticket identifier");
+	}
+	return parsed;
+}
+
 export async function createOwnedTicketReply(
 	db: TicketReplyDb,
 	input: { ticketId: bigint; userId: number; content: string },