Add submission model

docs/application-project-submission-rfc.md

@@ -383,13 +383,12 @@ Project не является заявкой. Он может быть:
 - `id`
 - `application`
 - `program`
-- `stage`, nullable
+- `stage_key`, строковый ключ этапа
 - `submitted_by`
 - `title`
 - `description`
 - `form_data`, JSON
 - `links`, JSON/list
-- `files` relation
 - `status`
 - `version`
 - `submitted_at`
@@ -409,10 +408,11 @@ Project не является заявкой. Он может быть:
 - `submitted` - отправлена;
 - `returned` - возвращена на доработку;
 - `final` - финальная версия зафиксирована.
+- `cancelled` - сдача отменена.
 
 Ограничения от дублей:
 
-- выбрать стратегию уникальности: `application + stage + version` или `application + stage + active_status`;
+- уникальность `application + stage_key + version`;
 - повторный POST должен быть идемпотентным или защищенным constraint-ами;
 - нельзя создавать сдачу для отозванной, отклоненной или отмененной заявки, если правила программы это запрещают.
 
@@ -426,6 +426,11 @@ Project не является заявкой. Он может быть:
 
 Submission не является заявкой и не является проектом. Это событие или версия сдачи решения. Эксперт должен оценивать конкретную сдачу, а не абстрактный проект, который может измениться после дедлайна.
 
+MVP-заметка: отдельная модель `Stage` пока не создается, вместо нее используется
+`stage_key="main"`. Модели `SubmissionFile` и `SubmissionLink` также отложены:
+ссылки временно хранятся в `links` как JSON-массив, а полноценные этапы и файлы
+будут добавлены отдельными PR.
+
 ### SubmissionFile / SubmissionLink
 
 Назначение: вложения и ссылки, прикрепленные к конкретной сдаче.

partner_programs/admin.py

@@ -18,6 +18,7 @@
     PartnerProgramMaterial,
     PartnerProgramProject,
     PartnerProgramUserProfile,
+    Submission,
 )
 from partner_programs.services import prepare_project_scores_export_data
 
@@ -60,6 +61,48 @@ class ApplicationAdmin(admin.ModelAdmin):
     date_hierarchy = "created_at"
 
 
+@admin.register(Submission)
+class SubmissionAdmin(admin.ModelAdmin):
+    list_display = (
+        "id",
+        "application",
+        "program",
+        "submitted_by",
+        "title",
+        "status",
+        "stage_key",
+        "version",
+        "submitted_at",
+        "created_at",
+        "updated_at",
+    )
+    list_filter = (
+        "status",
+        "program",
+        "stage_key",
+        "created_at",
+    )
+    search_fields = (
+        "title",
+        "submitted_by__email",
+        "submitted_by__first_name",
+        "submitted_by__last_name",
+        "program__name",
+        "program__tag",
+        "=application__id",
+    )
+    raw_id_fields = (
+        "application",
+        "program",
+        "submitted_by",
+    )
+    readonly_fields = (
+        "created_at",
+        "updated_at",
+    )
+    date_hierarchy = "created_at"
+
+
 class PartnerProgramMaterialInline(admin.StackedInline):
     model = PartnerProgramMaterial
     extra = 1

partner_programs/migrations/0019_submission.py

@@ -0,0 +1,94 @@
+# Generated by Django 4.2.11 on 2026-07-20 13:30
+
+from django.conf import settings
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        migrations.swappable_dependency(settings.AUTH_USER_MODEL),
+        ("partner_programs", "0018_application"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Submission",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                ("title", models.CharField(max_length=255)),
+                ("description", models.TextField(blank=True)),
+                ("form_data", models.JSONField(blank=True, default=dict)),
+                ("links", models.JSONField(blank=True, default=list)),
+                (
+                    "status",
+                    models.CharField(
+                        choices=[
+                            ("draft", "Draft"),
+                            ("submitted", "Submitted"),
+                            ("returned", "Returned"),
+                            ("final", "Final"),
+                            ("cancelled", "Cancelled"),
+                        ],
+                        default="draft",
+                        max_length=16,
+                    ),
+                ),
+                ("version", models.PositiveIntegerField(default=1)),
+                ("stage_key", models.CharField(default="main", max_length=128)),
+                ("submitted_at", models.DateTimeField(blank=True, null=True)),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                (
+                    "application",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="submissions",
+                        to="partner_programs.application",
+                    ),
+                ),
+                (
+                    "program",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="submissions",
+                        to="partner_programs.partnerprogram",
+                    ),
+                ),
+                (
+                    "submitted_by",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.PROTECT,
+                        related_name="program_submissions",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "Submission",
+                "verbose_name_plural": "Submissions",
+            },
+        ),
+        migrations.AddConstraint(
+            model_name="submission",
+            constraint=models.UniqueConstraint(
+                fields=("application", "stage_key", "version"),
+                name="uniq_submission_application_stage_version",
+            ),
+        ),
+        migrations.AddConstraint(
+            model_name="submission",
+            constraint=models.CheckConstraint(
+                check=models.Q(("version__gte", 1)), name="submission_version_gte_1"
+            ),
+        ),
+    ]

partner_programs/models.py

@@ -294,6 +294,138 @@ def __str__(self):
         )
 
 
+class Submission(models.Model):
+    """Versioned solution submitted for an application and program stage."""
+
+    STATUS_DRAFT = "draft"
+    STATUS_SUBMITTED = "submitted"
+    STATUS_RETURNED = "returned"
+    STATUS_FINAL = "final"
+    STATUS_CANCELLED = "cancelled"
+
+    STATUS_CHOICES = (
+        (STATUS_DRAFT, "Draft"),
+        (STATUS_SUBMITTED, "Submitted"),
+        (STATUS_RETURNED, "Returned"),
+        (STATUS_FINAL, "Final"),
+        (STATUS_CANCELLED, "Cancelled"),
+    )
+
+    EDITABLE_STATUSES = (
+        STATUS_DRAFT,
+        STATUS_RETURNED,
+    )
+
+    application = models.ForeignKey(
+        Application,
+        on_delete=models.CASCADE,
+        related_name="submissions",
+    )
+    program = models.ForeignKey(
+        PartnerProgram,
+        on_delete=models.CASCADE,
+        related_name="submissions",
+    )
+    submitted_by = models.ForeignKey(
+        User,
+        on_delete=models.PROTECT,
+        related_name="program_submissions",
+    )
+    title = models.CharField(max_length=255)
+    description = models.TextField(blank=True)
+    form_data = models.JSONField(default=dict, blank=True)
+    links = models.JSONField(default=list, blank=True)
+    status = models.CharField(
+        max_length=16,
+        choices=STATUS_CHOICES,
+        default=STATUS_DRAFT,
+    )
+    version = models.PositiveIntegerField(default=1)
+    stage_key = models.CharField(max_length=128, default="main")
+    submitted_at = models.DateTimeField(null=True, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True)
+    updated_at = models.DateTimeField(auto_now=True)
+
+    def clean(self):
+        super().clean()
+
+        errors = {}
+        if self.application_id:
+            application = self.application
+
+            if self.program_id and self.program_id != application.program_id:
+                errors["program"] = "Program must match the application's program."
+
+            allowed_submitter_ids = {
+                application.user_id,
+                application.created_by_id,
+            }
+            allowed_submitter_ids.discard(None)
+            if (
+                self.submitted_by_id
+                and self.submitted_by_id not in allowed_submitter_ids
+            ):
+                errors["submitted_by"] = (
+                    "Submitted by must match the application user or creator."
+                )
+
+            if self._state.adding and application.status in (
+                Application.STATUS_WITHDRAWN,
+                Application.STATUS_REJECTED,
+                Application.STATUS_CANCELLED,
+            ):
+                errors["application"] = (
+                    "Submissions cannot be created for inactive applications."
+                )
+
+        if errors:
+            raise ValidationError(errors)
+
+    def save(self, *args, **kwargs):
+        self.full_clean()
+        return super().save(*args, **kwargs)
+
+    @property
+    def is_draft(self):
+        return self.status == self.STATUS_DRAFT
+
+    @property
+    def is_submitted(self):
+        return self.status == self.STATUS_SUBMITTED
+
+    @property
+    def is_final(self):
+        return self.status == self.STATUS_FINAL
+
+    @property
+    def can_edit(self):
+        return self.status in self.EDITABLE_STATUSES
+
+    @property
+    def can_submit(self):
+        return self.status in self.EDITABLE_STATUSES
+
+    class Meta:
+        verbose_name = "Submission"
+        verbose_name_plural = "Submissions"
+        constraints = [
+            models.UniqueConstraint(
+                fields=["application", "stage_key", "version"],
+                name="uniq_submission_application_stage_version",
+            ),
+            models.CheckConstraint(
+                check=models.Q(version__gte=1),
+                name="submission_version_gte_1",
+            ),
+        ]
+
+    def __str__(self):
+        return (
+            f"Submission<{self.pk}> application={self.application_id} "
+            f"stage={self.stage_key} version={self.version} status={self.status}"
+        )
+
+
 class PartnerProgramUserProfile(models.Model):
     """
     PartnerProgramUserProfile model