explain me why django-migration defer from sqlall and raise exception in exist table

i have existing table created by FDW (Foreign data wrappers)  named 'stateagency_stateagency'.

two models

class StateAgency(models.Model): 
    id = models.AutoField(primary_key=True) 
    name = models.CharField(max_length=100) 
        class Meta: 
                managed = False



class Document(models.Model): 
    id = models.UUIDField(primary_key=True, editable=False, default=uuid.uuid1)  
    stagcy = models.ForeignKey(StateAgency, to_field='id')

ti set managed = False

if i run command: python manage.py sqlall, i give that DDL:

CREATE TABLE "statements_document" (      "id" uuid NOT NULL PRIMARY KEY,      "stagcy_id" integer NOT NULL  );

"stagcy_id" integer this not foreign key it very important
but when i run python manage.py sqlmigrate statements 0001

CREATE TABLE "statements_document" (      "id" UUID NOT NULL PRIMARY KEY  );    -- omitted other sql --  ALTER TABLE "statements_document" ADD CONSTRAINT "statem_stagcy_id_fk_stateagency_stateagency_id" FOREIGN KEY ("stagcy_id") REFERENCES "stateagency_stateagency" ("id") DEFERRABLE INITIALLY DEFERRED;

NOTE:
django use FOREIGN KEY and when i run python manage.py migrate i catch exception, but table already exists

django.db.utils.ProgrammingError: referenced relation "stateagency_stateagency" is not a table




why it have this behavior?

how i can create migration without giving a reference, or by indicating 'stateagency_stateagency' table.

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