How to fix File name too long in PostgreSQL

When PostgreSQL raises the error, check the error message for context. If not clear, review your CREATE TABLE, CREATE INDEX, or ALTER TABLE statement. Count the bytes of each identifier—remember that multi-byte UTF-8 characters count as multiple bytes (e.g., é counts as 2 bytes). Use SELECT length(identifier_name) if analyzing existing identifiers.

Rename the table, column, or constraint to be 63 bytes or fewer. Use abbreviations or remove redundant words. For example:

-- BAD: 76 bytes
CREATE TABLE user_authentication_permission_settings (
  user_authentication_permission_settings_id SERIAL
);

-- GOOD: 42 bytes
CREATE TABLE user_auth_perm_settings (
  id SERIAL
);

If auto-generated names fail, specify shorter custom names:

CREATE TABLE user_profiles (
  id SERIAL,
  email VARCHAR(255) NOT NULL,
  CONSTRAINT uc_user_email UNIQUE (email),
  CONSTRAINT pk_user_profiles PRIMARY KEY (id)
);

-- Or explicitly create the sequence
CREATE SEQUENCE user_profiles_id_seq;
ALTER TABLE user_profiles ALTER COLUMN id SET DEFAULT nextval('user_profiles_id_seq');

Update your ORM mappings, SQL queries, and column aliases to use the new shorter names:

// TypeORM example
@Entity('user_auth_perm_settings')
export class UserAuthPermSettings {
  @PrimaryGeneratedColumn()
  id: number;
}

// Prisma example
model user_auth_perm_settings {
  id    Int     @id @default(autoincrement())
}

PostgreSQL applies the 63-byte limit uniformly. Use lowercase identifiers where possible, as quoted identifiers preserve case and may be longer in some contexts. If you must use long names, consider whether the naming convention is necessary.