Add application model

docs/application-project-submission-rfc.md

@@ -125,6 +125,11 @@ PROCOLLAB работает с кейс-чемпионатами, хакатон
 - `created_at`
 - `updated_at`
 
+MVP implementation note: `team` is intentionally not added in the first
+`Application` model PR because the `Team` model does not exist yet. Until the
+Team PR lands, backend validation treats `Application` as an individual
+application and requires `user`.
+
 Связи:
 
 - принадлежит одному `Program`;

partner_programs/admin.py

@@ -11,6 +11,7 @@
 from core.utils import XlsxFileToExport, build_xlsx_download_response
 from mailing.views import MailingTemplateRender
 from partner_programs.models import (
+    Application,
     PartnerProgram,
     PartnerProgramField,
     PartnerProgramFieldValue,
@@ -21,6 +22,44 @@
 from partner_programs.services import prepare_project_scores_export_data
 
 
+@admin.register(Application)
+class ApplicationAdmin(admin.ModelAdmin):
+    list_display = (
+        "id",
+        "program",
+        "user",
+        "created_by",
+        "status",
+        "project",
+        "submitted_at",
+        "created_at",
+        "updated_at",
+    )
+    list_filter = (
+        "status",
+        "program",
+        "created_at",
+    )
+    search_fields = (
+        "user__email",
+        "created_by__email",
+        "program__name",
+        "program__tag",
+        "project__name",
+    )
+    raw_id_fields = (
+        "program",
+        "user",
+        "created_by",
+        "project",
+    )
+    readonly_fields = (
+        "created_at",
+        "updated_at",
+    )
+    date_hierarchy = "created_at"
+
+
 class PartnerProgramMaterialInline(admin.StackedInline):
     model = PartnerProgramMaterial
     extra = 1

partner_programs/migrations/0018_application.py

@@ -0,0 +1,104 @@
+# Generated by Django 4.2.24 on 2026-07-20
+
+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", "0017_alter_partnerprogramproject_options"),
+        ("projects", "0033_delete_projectnews"),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name="Application",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "status",
+                    models.CharField(
+                        choices=[
+                            ("draft", "Draft"),
+                            ("submitted", "Submitted"),
+                            ("approved", "Approved"),
+                            ("rejected", "Rejected"),
+                            ("withdrawn", "Withdrawn"),
+                            ("cancelled", "Cancelled"),
+                        ],
+                        default="draft",
+                        max_length=16,
+                    ),
+                ),
+                ("form_data", models.JSONField(blank=True, default=dict)),
+                ("submitted_at", models.DateTimeField(blank=True, null=True)),
+                ("approved_at", models.DateTimeField(blank=True, null=True)),
+                ("rejected_at", models.DateTimeField(blank=True, null=True)),
+                ("withdrawn_at", models.DateTimeField(blank=True, null=True)),
+                ("created_at", models.DateTimeField(auto_now_add=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                (
+                    "created_by",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.PROTECT,
+                        related_name="created_program_applications",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+                (
+                    "program",
+                    models.ForeignKey(
+                        on_delete=django.db.models.deletion.CASCADE,
+                        related_name="applications",
+                        to="partner_programs.partnerprogram",
+                    ),
+                ),
+                (
+                    "project",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        related_name="applications",
+                        to="projects.project",
+                    ),
+                ),
+                (
+                    "user",
+                    models.ForeignKey(
+                        blank=True,
+                        null=True,
+                        on_delete=django.db.models.deletion.SET_NULL,
+                        related_name="program_applications",
+                        to=settings.AUTH_USER_MODEL,
+                    ),
+                ),
+            ],
+            options={
+                "verbose_name": "Application",
+                "verbose_name_plural": "Applications",
+            },
+        ),
+        migrations.AddConstraint(
+            model_name="application",
+            constraint=models.UniqueConstraint(
+                condition=models.Q(
+                    ("status__in", ("draft", "submitted", "approved")),
+                    ("user__isnull", False),
+                ),
+                fields=("user", "program"),
+                name="uniq_active_application_user_program",
+            ),
+        ),
+    ]

partner_programs/models.py

@@ -176,6 +176,124 @@ def is_project_submission_open(self) -> bool:
         return deadline is None or deadline >= timezone.now()
 
 
+class Application(models.Model):
+    """
+    MVP application model for participation in a partner program.
+
+    Team applications are intentionally deferred until the Team model exists.
+    For now, an application is individual and must have `user`.
+    """
+
+    STATUS_DRAFT = "draft"
+    STATUS_SUBMITTED = "submitted"
+    STATUS_APPROVED = "approved"
+    STATUS_REJECTED = "rejected"
+    STATUS_WITHDRAWN = "withdrawn"
+    STATUS_CANCELLED = "cancelled"
+
+    ACTIVE_STATUSES = (
+        STATUS_DRAFT,
+        STATUS_SUBMITTED,
+        STATUS_APPROVED,
+    )
+
+    STATUS_CHOICES = (
+        (STATUS_DRAFT, "Draft"),
+        (STATUS_SUBMITTED, "Submitted"),
+        (STATUS_APPROVED, "Approved"),
+        (STATUS_REJECTED, "Rejected"),
+        (STATUS_WITHDRAWN, "Withdrawn"),
+        (STATUS_CANCELLED, "Cancelled"),
+    )
+
+    program = models.ForeignKey(
+        PartnerProgram,
+        on_delete=models.CASCADE,
+        related_name="applications",
+    )
+    user = models.ForeignKey(
+        User,
+        on_delete=models.SET_NULL,
+        related_name="program_applications",
+        null=True,
+        blank=True,
+    )
+    created_by = models.ForeignKey(
+        User,
+        on_delete=models.PROTECT,
+        related_name="created_program_applications",
+    )
+    status = models.CharField(
+        max_length=16,
+        choices=STATUS_CHOICES,
+        default=STATUS_DRAFT,
+    )
+    form_data = models.JSONField(default=dict, blank=True)
+    project = models.ForeignKey(
+        Project,
+        on_delete=models.SET_NULL,
+        related_name="applications",
+        null=True,
+        blank=True,
+    )
+    submitted_at = models.DateTimeField(null=True, blank=True)
+    approved_at = models.DateTimeField(null=True, blank=True)
+    rejected_at = models.DateTimeField(null=True, blank=True)
+    withdrawn_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 not self.user_id:
+            errors["user"] = (
+                "User is required for MVP applications until Team is implemented."
+            )
+
+        if self.user_id and self.program_id and self.status in self.ACTIVE_STATUSES:
+            duplicate_qs = Application.objects.filter(
+                user_id=self.user_id,
+                program_id=self.program_id,
+                status__in=self.ACTIVE_STATUSES,
+            )
+            if self.pk:
+                duplicate_qs = duplicate_qs.exclude(pk=self.pk)
+            if duplicate_qs.exists():
+                errors["user"] = (
+                    "User already has an active application for this program."
+                )
+
+        if errors:
+            raise ValidationError(errors)
+
+    def save(self, *args, **kwargs):
+        self.full_clean()
+        return super().save(*args, **kwargs)
+
+    class Meta:
+        verbose_name = "Application"
+        verbose_name_plural = "Applications"
+        constraints = [
+            models.UniqueConstraint(
+                fields=["user", "program"],
+                condition=models.Q(
+                    user__isnull=False,
+                    status__in=("draft", "submitted", "approved"),
+                ),
+                name="uniq_active_application_user_program",
+            ),
+        ]
+
+    def __str__(self):
+        return (
+            f"Application<{self.pk}> "
+            f"user={self.user_id} program={self.program_id} status={self.status}"
+        )
+
+
 class PartnerProgramUserProfile(models.Model):
     """
     PartnerProgramUserProfile model