Why can't PostgreSQL see the column?

Question

PostgreSQL

Django 2
when trying to save to a query variable, the query throws this error

>>> query = Post.objects.create(title='Блюдо1', slug='Здесь рецепт и описание', category='category',  cost='Цена')
Traceback (most recent call last):
  File "<input>", line 1, in <module>
    query = Post.objects.create(title='Блюдо1', slug='Здесь рецепт и описание', category='category',  cost='Цена')
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/models/manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/models/query.py", line 413, in create
    obj.save(force_insert=True, using=self.db)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/models/base.py", line 718, in save
    force_update=force_update, update_fields=update_fields)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/models/base.py", line 748, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/models/base.py", line 831, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/models/base.py", line 869, in _do_insert
    using=using, raw=raw)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/models/manager.py", line 82, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/models/query.py", line 1136, in _insert
    return query.get_compiler(using=using).execute_sql(return_id)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1289, in execute_sql
    cursor.execute(sql, params)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/backends/utils.py", line 100, in execute
    return super().execute(sql, params)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/backends/utils.py", line 68, in execute
    return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/backends/utils.py", line 77, in _execute_with_wrappers
    return executor(sql, params, many, context)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/utils.py", line 89, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/home/ivan/.local/lib/python3.6/site-packages/django/db/backends/utils.py", line 85, in _execute
    return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: ОШИБКА:  столбец "category" в таблице "tst_post" не существует
LINE 1: INSERT INTO "tst_post" ("title", "slug", "category", "cost")...

Performed all migrations, etc.
Models .py file code

from django.db import models

class Post(models.Model):
  title = models.CharField(max_length=30, db_index=True)
  slug = models.SlugField(max_length=150, unique=True)
  category = models.TextField(blank=True, db_index=True)
  cost = models.TextField(max_length=9, db_index=True)
  def __str__(self):
    return '{}'.format(self.tit

Answer 1

Maybe they accidentally started writing category with Russian “s”?