How to add a row in the postgres table when it is showing duplicate id error even though I haven't passed an id? [duplicate] - postgresql

Question

This question already has answers here:
How to reset Postgres' primary key sequence when it falls out of sync?
(33 answers)
Why do SQL id sequences go out of sync (specifically using Postgres)?
(2 answers)
Closed 3 days ago.
So, I generated a table called person from mockaroo of about 1000 rows.
Column | Type | Collation | Nullable | Default
------------------+-----------------------+-----------+----------+------------------------------------
id | bigint | | not null | nextval('person_id_seq'::regclass)
first_name | character varying(100) | | not null |
last_name | character varying(100) | | not null |
gender | character varying(7) | | not null |
email | character varying(100) | | |
date_of_birth | date | | not null |
country_of_birth | character varying(100) | | not null |
Indexes:
"person_pkey" PRIMARY KEY, btree (id)
"person_email_key" UNIQUE CONSTRAINT, btree (email)
Above are the table details.
I am trying to insert a row into the table. Since, I gave id as BIGSERIAL datatype, its supposed to auto increment the id for me and everytime I generate a row.
But, now as I am trying to insert a new row it's showing me duplicate id error.
test=# INSERT INTO person (first_name, last_name, gender, email, date_of_birth, country_of_birth) VALUES ('Sean', 'Paul','Male', 'paul#gmail.com','2001-03-02','India');
ERROR: duplicate key value violates unique constraint "person_pkey"
DETAIL: Key (id)=(2) already exists.

Answer 1

The problem can be one of the following:
somebody ran ALTER SEQUENCE or called the setval function to reset the sequence counter
somebody INSERTed a row with an explicit value of 2 for id, so that the default value was overridden rather than using a sequence value
You can reduce the danger of the latter happening by using identity columns with GENERATED ALWAYS AS IDENTITY.