feat(database): increase passwordHash length and add migration snapshot

- Extended `passwordHash` field length in `users` schema from 100 to 255.
- Added migration snapshot for schema updates.

backend/src/database/schemas/pgp.ts

@@ -21,14 +21,19 @@ const getPgpKey = () => process.env.PGP_ENCRYPTION_KEY || "default-pgp-key";
  * withAutomaticPgpDecrypt(users.email);
  * ```
  */
-export const pgpEncrypted = customType<{ data: string; driverData: Buffer }>({
+export const pgpEncrypted = customType<{
+	data: string | null;
+	driverData: Buffer | string | null | SQL;
+}>({
 	dataType() {
 		return "bytea";
 	},
-	toDriver(value: string): SQL {
+	toDriver(value: string | null): SQL | null {
+		if (value === null) return null;
 		return sql`pgp_sym_encrypt(${value}, ${getPgpKey()})`;
 	},
-	fromDriver(value: Buffer | string): string {
+	fromDriver(value: Buffer | string | null | any): string | null {
+		if (value === null || value === undefined) return null;
 		if (typeof value === "string") return value;
 		return value.toString();
 	},

backend/src/database/schemas/users.ts

@@ -29,7 +29,7 @@ export const users = pgTable(
 		displayName: varchar("display_name", { length: 32 }),
 
 		username: varchar("username", { length: 32 }).notNull().unique(),
-		passwordHash: varchar("password_hash", { length: 100 }).notNull(),
+		passwordHash: varchar("password_hash", { length: 255 }).notNull(),
 		avatarUrl: varchar("avatar_url", { length: 512 }),
 		bio: varchar("bio", { length: 255 }),