feat(ingestion): add first public LBA Serie A importer

README.md

@@ -16,6 +16,7 @@ The current application baseline provides:
 - user-scoped plain-text scouting notes on player detail pages
 - user-scoped saved searches (save, rerun, delete)
 - first real-data ingestion command baseline (`import_hoopdata_demo_competition`) with idempotent source-identity mapping
+- first public European importer (`import_lba_public_serie_a`) for LBA Serie A player-stat scope with idempotent external-ID binding
 
 Accepted technical and product-shaping decisions live in:
 - `docs/ARCHITECTURE.md`
@@ -66,6 +67,12 @@ First real-data importer (ADR-0009 baseline):
 - explicit input path import:
   `docker compose --env-file .env -f infra/docker-compose.yml exec -T app python manage.py import_hoopdata_demo_competition --input /app/scouting/sample_data/imports/hoopdata_demo_serie_a2_2025_2026.json`
 
+First public European importer (LBA Serie A scope):
+- live public-source import (season start year 2025):
+  `docker compose --env-file .env -f infra/docker-compose.yml exec -T app python manage.py import_lba_public_serie_a --season 2025`
+- deterministic local-fixture import:
+  `docker compose --env-file .env -f infra/docker-compose.yml exec -T app python manage.py import_lba_public_serie_a --season 2025 --fixture /app/scouting/sample_data/imports/lba_public_serie_a_fixture.json`
+
 Legacy shared favorites and notes from the pre-auth MVP are cleared by the early-stage ownership migration so the app can move cleanly to user-scoped data.
 
 ## Workflow

app/scouting/importers/lba_public.py

@@ -0,0 +1,359 @@
+from __future__ import annotations
+
+import json
+from dataclasses import dataclass
+from decimal import Decimal
+from pathlib import Path
+from urllib.error import URLError
+from urllib.parse import urlencode
+from urllib.request import urlopen
+
+from django.db import transaction
+
+from scouting.models import (
+    Competition,
+    ExternalEntityMapping,
+    Player,
+    PlayerSeason,
+    PlayerSeasonStats,
+    Season,
+    Team,
+)
+
+
+class ImportValidationError(ValueError):
+    pass
+
+
+LBA_SOURCE_NAME = "lba_public"
+LBA_COMPETITION_EXTERNAL_ID = "lba-serie-a"
+LBA_COMPETITION_NAME = "Lega Basket Serie A"
+LBA_COUNTRY = "IT"
+LBA_LEVEL = "top"
+LBA_STATS_ENDPOINT = "https://www.legabasket.it/api/statistics/get-players-statistics"
+LBA_STAT_CATEGORIES = ["points", "assists", "regain_balls", "lost_balls", "plus_minus", "rating_oer"]
+CATEGORY_TO_MODEL_FIELD = {
+    "points": "points",
+    "assists": "assists",
+    "regain_balls": "steals",
+    "lost_balls": "turnovers",
+    "plus_minus": "plus_minus",
+    "rating_oer": "offensive_rating",
+}
+
+
+@dataclass
+class ImportSummary:
+    players_created: int = 0
+    players_updated: int = 0
+    teams_created: int = 0
+    teams_updated: int = 0
+    contexts_created: int = 0
+    contexts_updated: int = 0
+
+
+class LbaPublicStatsSource:
+    def __init__(self, base_url: str = LBA_STATS_ENDPOINT, timeout_sec: int = 30):
+        self.base_url = base_url
+        self.timeout_sec = timeout_sec
+
+    def fetch_category(self, season_start_year: int, category: str) -> dict:
+        query = urlencode({"s": season_start_year, "cat": category})
+        url = f"{self.base_url}?{query}"
+        try:
+            with urlopen(url, timeout=self.timeout_sec) as response:
+                payload = json.loads(response.read().decode("utf-8"))
+        except URLError as exc:
+            raise ImportValidationError(f"Could not fetch LBA source URL '{url}': {exc}") from exc
+        except json.JSONDecodeError as exc:
+            raise ImportValidationError(f"Invalid JSON received from '{url}': {exc}") from exc
+
+        if not isinstance(payload, dict) or "stats" not in payload:
+            raise ImportValidationError(f"LBA source response from '{url}' is missing 'stats'.")
+        return payload
+
+
+class LbaFixtureStatsSource:
+    def __init__(self, fixture_path: Path):
+        self.fixture_path = fixture_path
+        try:
+            payload = json.loads(fixture_path.read_text(encoding="utf-8"))
+        except FileNotFoundError as exc:
+            raise ImportValidationError(f"Fixture file not found: {fixture_path}") from exc
+        except json.JSONDecodeError as exc:
+            raise ImportValidationError(f"Invalid fixture JSON at '{fixture_path}': {exc}") from exc
+
+        categories = payload.get("categories")
+        if not isinstance(categories, dict):
+            raise ImportValidationError("Fixture payload must include a 'categories' object.")
+        self.categories = categories
+
+    def fetch_category(self, season_start_year: int, category: str) -> dict:
+        del season_start_year
+        payload = self.categories.get(category)
+        if payload is None:
+            raise ImportValidationError(f"Fixture payload missing category '{category}'.")
+        if not isinstance(payload, dict) or "stats" not in payload:
+            raise ImportValidationError(f"Fixture category '{category}' is missing 'stats'.")
+        return payload
+
+
+class LbaSerieAPublicImporter:
+    def __init__(self, *, season_start_year: int, source: LbaPublicStatsSource | LbaFixtureStatsSource):
+        self.season_start_year = season_start_year
+        self.source = source
+        self.summary = ImportSummary()
+
+    @transaction.atomic
+    def run(self) -> ImportSummary:
+        aggregated = self._collect_players()
+        competition = self._upsert_competition()
+
+        for record in aggregated.values():
+            season = self._upsert_season(record["year"])
+            team = self._upsert_team(record)
+            player = self._upsert_player(record)
+            context = self._upsert_player_season(record, player, team, season, competition)
+            self._upsert_stats(context, record)
+
+        return self.summary
+
+    def _collect_players(self) -> dict:
+        players = {}
+
+        for category in LBA_STAT_CATEGORIES:
+            payload = self.source.fetch_category(self.season_start_year, category)
+            stats = payload.get("stats")
+            if not isinstance(stats, list):
+                raise ImportValidationError(f"Category '{category}' response must include a list in 'stats'.")
+
+            for row in stats:
+                self._validate_stat_row(category, row)
+                key = (row["player_id"], row["team_id"], row["year"])
+                if key not in players:
+                    players[key] = {
+                        "player_id": row["player_id"],
+                        "team_id": row["team_id"],
+                        "year": row["year"],
+                        "name": row["name"],
+                        "surname": row["surname"],
+                        "team_name": row["team_name"],
+                        "scores": {},
+                    }
+                players[key]["scores"][category] = self._to_decimal(row.get("score"))
+
+        if not players:
+            raise ImportValidationError("No player statistics found from LBA source.")
+        return players
+
+    def _validate_stat_row(self, category: str, row: dict) -> None:
+        if not isinstance(row, dict):
+            raise ImportValidationError(f"Category '{category}' contains a non-object stat row.")
+        for field in ["player_id", "team_id", "year", "name", "surname", "team_name", "score"]:
+            if row.get(field) in (None, ""):
+                raise ImportValidationError(f"Category '{category}' row missing required field '{field}'.")
+
+    @staticmethod
+    def _to_decimal(value) -> Decimal:
+        return Decimal(str(value))
+
+    def _mapping_for(self, entity_type: str, external_id: str) -> ExternalEntityMapping | None:
+        return ExternalEntityMapping.objects.filter(
+            source_name=LBA_SOURCE_NAME,
+            entity_type=entity_type,
+            external_id=external_id,
+        ).first()
+
+    def _bind_mapping(self, *, entity_type: str, external_id: str, object_id: int) -> None:
+        existing_for_external = ExternalEntityMapping.objects.filter(
+            source_name=LBA_SOURCE_NAME,
+            entity_type=entity_type,
+            external_id=external_id,
+        ).first()
+        if existing_for_external and existing_for_external.object_id != object_id:
+            raise ImportValidationError(
+                f"External ID '{external_id}' for {entity_type} is already linked to a different record."
+            )
+
+        existing_for_object = ExternalEntityMapping.objects.filter(
+            source_name=LBA_SOURCE_NAME,
+            entity_type=entity_type,
+            object_id=object_id,
+        ).first()
+        if existing_for_object and existing_for_object.external_id != external_id:
+            raise ImportValidationError(
+                f"Conflicting mapping for {entity_type} object {object_id}: "
+                f"'{existing_for_object.external_id}' vs '{external_id}'."
+            )
+
+        ExternalEntityMapping.objects.get_or_create(
+            source_name=LBA_SOURCE_NAME,
+            entity_type=entity_type,
+            external_id=external_id,
+            defaults={"object_id": object_id},
+        )
+
+    def _upsert_competition(self) -> Competition:
+        mapping = self._mapping_for(ExternalEntityMapping.EntityType.COMPETITION, LBA_COMPETITION_EXTERNAL_ID)
+        defaults = {"country": LBA_COUNTRY, "level": LBA_LEVEL}
+        if mapping:
+            competition = Competition.objects.filter(pk=mapping.object_id).first()
+            if competition is None:
+                raise ImportValidationError("Competition mapping points to a missing record.")
+            Competition.objects.filter(pk=competition.pk).update(name=LBA_COMPETITION_NAME, **defaults)
+            competition.refresh_from_db()
+        else:
+            competition, _ = Competition.objects.get_or_create(name=LBA_COMPETITION_NAME, defaults=defaults)
+
+        self._bind_mapping(
+            entity_type=ExternalEntityMapping.EntityType.COMPETITION,
+            external_id=LBA_COMPETITION_EXTERNAL_ID,
+            object_id=competition.id,
+        )
+        return competition
+
+    def _upsert_season(self, year: int) -> Season:
+        season_name = f"{year}-{year + 1}"
+        season, created = Season.objects.get_or_create(
+            name=season_name,
+            defaults={"start_year": year, "end_year": year + 1},
+        )
+        if not created and (season.start_year != year or season.end_year != year + 1):
+            raise ImportValidationError(
+                f"Season '{season_name}' exists but does not match expected years {year}-{year + 1}."
+            )
+        return season
+
+    def _upsert_team(self, record: dict) -> Team:
+        external_id = str(record["team_id"])
+        mapping = self._mapping_for(ExternalEntityMapping.EntityType.TEAM, external_id)
+
+        if mapping:
+            team = Team.objects.filter(pk=mapping.object_id).first()
+            if team is None:
+                raise ImportValidationError("Team mapping points to a missing record.")
+            updates = []
+            if team.name != record["team_name"]:
+                team.name = record["team_name"]
+                updates.append("name")
+            if team.country != LBA_COUNTRY:
+                team.country = LBA_COUNTRY
+                updates.append("country")
+            if updates:
+                team.save(update_fields=updates + ["updated_at"])
+            self.summary.teams_updated += 1
+        else:
+            team, created = Team.objects.get_or_create(
+                name=record["team_name"],
+                country=LBA_COUNTRY,
+                defaults={},
+            )
+            if created:
+                self.summary.teams_created += 1
+            else:
+                self.summary.teams_updated += 1
+
+        self._bind_mapping(
+            entity_type=ExternalEntityMapping.EntityType.TEAM,
+            external_id=external_id,
+            object_id=team.id,
+        )
+        return team
+
+    def _upsert_player(self, record: dict) -> Player:
+        external_id = str(record["player_id"])
+        mapping = self._mapping_for(ExternalEntityMapping.EntityType.PLAYER, external_id)
+        full_name = f"{record['name']} {record['surname']}".strip()
+
+        if mapping:
+            player = Player.objects.filter(pk=mapping.object_id).first()
+            if player is None:
+                raise ImportValidationError("Player mapping points to a missing record.")
+            position = player.position or Player.Position.SG
+            player.full_name = full_name
+            player.first_name = record["name"]
+            player.last_name = record["surname"]
+            player.position = position
+            player.save()
+            self.summary.players_updated += 1
+        else:
+            # LBA stats endpoint does not expose position directly. To satisfy the current
+            # required model field without guessing role/taxonomy data, we use a neutral
+            # default and keep role/specialty ownership untouched.
+            player = Player.objects.create(
+                full_name=full_name,
+                first_name=record["name"],
+                last_name=record["surname"],
+                position=Player.Position.SG,
+            )
+            self.summary.players_created += 1
+
+        self._bind_mapping(
+            entity_type=ExternalEntityMapping.EntityType.PLAYER,
+            external_id=external_id,
+            object_id=player.id,
+        )
+        return player
+
+    def _upsert_player_season(
+        self,
+        record: dict,
+        player: Player,
+        team: Team,
+        season: Season,
+        competition: Competition,
+    ) -> PlayerSeason:
+        context_external_id = f"{record['year']}:{record['team_id']}:{record['player_id']}"
+        mapping = self._mapping_for(ExternalEntityMapping.EntityType.PLAYER_SEASON, context_external_id)
+
+        if mapping:
+            context = PlayerSeason.objects.filter(pk=mapping.object_id).first()
+            if context is None:
+                raise ImportValidationError("PlayerSeason mapping points to a missing record.")
+            if (
+                context.player_id != player.id
+                or context.team_id != team.id
+                or context.season_id != season.id
+                or context.competition_id != competition.id
+            ):
+                raise ImportValidationError("Mapped player-season context does not match incoming source identity.")
+            self.summary.contexts_updated += 1
+        else:
+            context, created = PlayerSeason.objects.get_or_create(
+                player=player,
+                team=team,
+                season=season,
+                competition=competition,
+                defaults={},
+            )
+            if created:
+                self.summary.contexts_created += 1
+            else:
+                self.summary.contexts_updated += 1
+
+        self._bind_mapping(
+            entity_type=ExternalEntityMapping.EntityType.PLAYER_SEASON,
+            external_id=context_external_id,
+            object_id=context.id,
+        )
+        return context
+
+    def _upsert_stats(self, context: PlayerSeason, record: dict) -> None:
+        stats_defaults = {
+            "points": None,
+            "assists": None,
+            "steals": None,
+            "turnovers": None,
+            "blocks": None,
+            "efg_pct": None,
+            "ts_pct": None,
+            "plus_minus": None,
+            "offensive_rating": None,
+            "defensive_rating": None,
+        }
+        for category, value in record["scores"].items():
+            model_field = CATEGORY_TO_MODEL_FIELD.get(category)
+            if model_field:
+                stats_defaults[model_field] = value
+
+        PlayerSeasonStats.objects.update_or_create(player_season=context, defaults=stats_defaults)

app/scouting/management/commands/import_lba_public_serie_a.py

@@ -0,0 +1,57 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+from django.core.management.base import BaseCommand, CommandError
+
+from scouting.importers.lba_public import (
+    LBA_SOURCE_NAME,
+    LbaFixtureStatsSource,
+    LbaPublicStatsSource,
+    LbaSerieAPublicImporter,
+    ImportValidationError,
+)
+
+
+class Command(BaseCommand):
+    help = "Import public LBA Serie A player statistics for one season using the ADR-0009 baseline flow."
+
+    def add_arguments(self, parser):
+        parser.add_argument(
+            "--season",
+            type=int,
+            default=2025,
+            help="Season start year to import from LBA public statistics API (default: 2025).",
+        )
+        parser.add_argument(
+            "--fixture",
+            default="",
+            help="Optional local fixture JSON path for deterministic/offline runs.",
+        )
+
+    def handle(self, *args, **options):
+        season_start_year = options["season"]
+        fixture_path = (options.get("fixture") or "").strip()
+
+        try:
+            if fixture_path:
+                source = LbaFixtureStatsSource(Path(fixture_path))
+                source_label = f"fixture={fixture_path}"
+            else:
+                source = LbaPublicStatsSource()
+                source_label = "public=https://www.legabasket.it/api/statistics/get-players-statistics"
+
+            summary = LbaSerieAPublicImporter(season_start_year=season_start_year, source=source).run()
+        except ImportValidationError as exc:
+            raise CommandError(f"LBA public import failed: {exc}") from exc
+
+        self.stdout.write(
+            self.style.SUCCESS(
+                "Imported LBA Serie A public statistics successfully. "
+                f"Source={LBA_SOURCE_NAME}; season={season_start_year}; "
+                f"players +{summary.players_created}/~{summary.players_updated}, "
+                f"teams +{summary.teams_created}/~{summary.teams_updated}, "
+                f"contexts +{summary.contexts_created}/~{summary.contexts_updated}."
+            )
+        )
+        self.stdout.write(f"Input: {source_label}")

app/scouting/sample_data/imports/lba_public_serie_a_fixture.json

@@ -0,0 +1,148 @@
+{
+  "categories": {
+    "points": {
+      "stats": [
+        {
+          "category": "points",
+          "player_id": 6609,
+          "name": "Muhammad-Ali",
+          "surname": "Abdur-Rahkman",
+          "team_name": "NutriBullet Treviso Basket",
+          "year": 2025,
+          "score": 19.5,
+          "team_id": 1642
+        },
+        {
+          "category": "points",
+          "player_id": 45,
+          "name": "Nicola",
+          "surname": "Akele",
+          "team_name": "Virtus Olidata Bologna",
+          "year": 2025,
+          "score": 11.2,
+          "team_id": 1715
+        }
+      ]
+    },
+    "assists": {
+      "stats": [
+        {
+          "category": "assists",
+          "player_id": 6609,
+          "name": "Muhammad-Ali",
+          "surname": "Abdur-Rahkman",
+          "team_name": "NutriBullet Treviso Basket",
+          "year": 2025,
+          "score": 4.4,
+          "team_id": 1642
+        },
+        {
+          "category": "assists",
+          "player_id": 45,
+          "name": "Nicola",
+          "surname": "Akele",
+          "team_name": "Virtus Olidata Bologna",
+          "year": 2025,
+          "score": 2.1,
+          "team_id": 1715
+        }
+      ]
+    },
+    "regain_balls": {
+      "stats": [
+        {
+          "category": "regain_balls",
+          "player_id": 6609,
+          "name": "Muhammad-Ali",
+          "surname": "Abdur-Rahkman",
+          "team_name": "NutriBullet Treviso Basket",
+          "year": 2025,
+          "score": 1.3,
+          "team_id": 1642
+        },
+        {
+          "category": "regain_balls",
+          "player_id": 45,
+          "name": "Nicola",
+          "surname": "Akele",
+          "team_name": "Virtus Olidata Bologna",
+          "year": 2025,
+          "score": 0.8,
+          "team_id": 1715
+        }
+      ]
+    },
+    "lost_balls": {
+      "stats": [
+        {
+          "category": "lost_balls",
+          "player_id": 6609,
+          "name": "Muhammad-Ali",
+          "surname": "Abdur-Rahkman",
+          "team_name": "NutriBullet Treviso Basket",
+          "year": 2025,
+          "score": 2.2,
+          "team_id": 1642
+        },
+        {
+          "category": "lost_balls",
+          "player_id": 45,
+          "name": "Nicola",
+          "surname": "Akele",
+          "team_name": "Virtus Olidata Bologna",
+          "year": 2025,
+          "score": 1.0,
+          "team_id": 1715
+        }
+      ]
+    },
+    "plus_minus": {
+      "stats": [
+        {
+          "category": "plus_minus",
+          "player_id": 6609,
+          "name": "Muhammad-Ali",
+          "surname": "Abdur-Rahkman",
+          "team_name": "NutriBullet Treviso Basket",
+          "year": 2025,
+          "score": 3.1,
+          "team_id": 1642
+        },
+        {
+          "category": "plus_minus",
+          "player_id": 45,
+          "name": "Nicola",
+          "surname": "Akele",
+          "team_name": "Virtus Olidata Bologna",
+          "year": 2025,
+          "score": 1.5,
+          "team_id": 1715
+        }
+      ]
+    },
+    "rating_oer": {
+      "stats": [
+        {
+          "category": "rating_oer",
+          "player_id": 6609,
+          "name": "Muhammad-Ali",
+          "surname": "Abdur-Rahkman",
+          "team_name": "NutriBullet Treviso Basket",
+          "year": 2025,
+          "score": 111.4,
+          "team_id": 1642
+        },
+        {
+          "category": "rating_oer",
+          "player_id": 45,
+          "name": "Nicola",
+          "surname": "Akele",
+          "team_name": "Virtus Olidata Bologna",
+          "year": 2025,
+          "score": 106.7,
+          "team_id": 1715
+        }
+      ]
+    }
+  }
+}

app/scouting/tests.py

@@ -1,9 +1,10 @@
 from datetime import date
 from decimal import Decimal
+from pathlib import Path
 from urllib.parse import urlencode
 
 from django.contrib.auth import get_user_model
-from django.core.management import call_command
+from django.core.management import CommandError, call_command
 from django.db import connection
 from django.db.migrations.executor import MigrationExecutor
 from django.test import TestCase, TransactionTestCase
@@ -526,6 +527,135 @@ class FirstRealIngestionFlowTests(TestCase):
         self.assertContains(detail_response, "PTS 17.2")
 
 
+class FirstPublicEuropeanImporterTests(TestCase):
+    COMMAND_NAME = "import_lba_public_serie_a"
+    SOURCE_NAME = "lba_public"
+    FIXTURE_PATH = Path(__file__).resolve().parent / "sample_data" / "imports" / "lba_public_serie_a_fixture.json"
+
+    def run_import(self):
+        call_command(self.COMMAND_NAME, fixture=str(self.FIXTURE_PATH), season=2025)
+
+    def test_importer_command_runs_successfully_for_lba_scope(self):
+        self.run_import()
+        self.assertGreaterEqual(Player.objects.count(), 2)
+
+    def test_importer_creates_expected_entities_contexts_and_stats(self):
+        self.run_import()
+
+        self.assertTrue(Competition.objects.filter(name="Lega Basket Serie A").exists())
+        self.assertTrue(Season.objects.filter(name="2025-2026", start_year=2025, end_year=2026).exists())
+        self.assertTrue(Player.objects.filter(full_name="Muhammad-Ali Abdur-Rahkman").exists())
+        self.assertTrue(Player.objects.filter(full_name="Nicola Akele").exists())
+        self.assertTrue(Team.objects.filter(name="NutriBullet Treviso Basket", country="IT").exists())
+        self.assertTrue(PlayerSeason.objects.filter(player__full_name="Muhammad-Ali Abdur-Rahkman").exists())
+        self.assertTrue(PlayerSeasonStats.objects.filter(player_season__player__full_name="Muhammad-Ali Abdur-Rahkman").exists())
+
+    def test_importer_is_idempotent_for_same_input(self):
+        self.run_import()
+        first_counts = {
+            "players": Player.objects.count(),
+            "teams": Team.objects.count(),
+            "contexts": PlayerSeason.objects.count(),
+            "stats": PlayerSeasonStats.objects.count(),
+            "mappings": ExternalEntityMapping.objects.filter(source_name=self.SOURCE_NAME).count(),
+        }
+
+        self.run_import()
+
+        self.assertEqual(Player.objects.count(), first_counts["players"])
+        self.assertEqual(Team.objects.count(), first_counts["teams"])
+        self.assertEqual(PlayerSeason.objects.count(), first_counts["contexts"])
+        self.assertEqual(PlayerSeasonStats.objects.count(), first_counts["stats"])
+        self.assertEqual(
+            ExternalEntityMapping.objects.filter(source_name=self.SOURCE_NAME).count(),
+            first_counts["mappings"],
+        )
+
+    def test_importer_respects_external_entity_mapping(self):
+        self.run_import()
+
+        self.assertTrue(
+            ExternalEntityMapping.objects.filter(
+                source_name=self.SOURCE_NAME,
+                entity_type=ExternalEntityMapping.EntityType.COMPETITION,
+                external_id="lba-serie-a",
+            ).exists()
+        )
+        self.assertTrue(
+            ExternalEntityMapping.objects.filter(
+                source_name=self.SOURCE_NAME,
+                entity_type=ExternalEntityMapping.EntityType.PLAYER,
+                external_id="6609",
+            ).exists()
+        )
+        self.assertTrue(
+            ExternalEntityMapping.objects.filter(
+                source_name=self.SOURCE_NAME,
+                entity_type=ExternalEntityMapping.EntityType.TEAM,
+                external_id="1642",
+            ).exists()
+        )
+        self.assertTrue(
+            ExternalEntityMapping.objects.filter(
+                source_name=self.SOURCE_NAME,
+                entity_type=ExternalEntityMapping.EntityType.PLAYER_SEASON,
+                external_id="2025:1642:6609",
+            ).exists()
+        )
+
+    def test_importer_does_not_overwrite_internal_scouting_enrichment(self):
+        role = Role.objects.create(name="internal role lba", slug="internal-role-lba")
+        specialty = Specialty.objects.create(name="internal specialty lba", slug="internal-specialty-lba")
+        self.run_import()
+
+        player = Player.objects.get(full_name="Muhammad-Ali Abdur-Rahkman")
+        player.roles.add(role)
+        player.specialties.add(specialty)
+
+        self.run_import()
+        player.refresh_from_db()
+
+        self.assertTrue(player.roles.filter(pk=role.pk).exists())
+        self.assertTrue(player.specialties.filter(pk=specialty.pk).exists())
+
+    def test_importer_does_not_interfere_with_user_owned_data(self):
+        self.run_import()
+        user = User.objects.create_user(username="lba_user", password="pass12345")
+        player = Player.objects.get(full_name="Muhammad-Ali Abdur-Rahkman")
+        favorite = FavoritePlayer.objects.create(user=user, player=player)
+        note = PlayerNote.objects.create(user=user, player=player, body="LBA imported profile")
+        saved = SavedSearch.objects.create(user=user, name="LBA Search", params={"name": "Muhammad"})
+
+        self.run_import()
+
+        self.assertTrue(FavoritePlayer.objects.filter(pk=favorite.pk).exists())
+        self.assertTrue(PlayerNote.objects.filter(pk=note.pk).exists())
+        self.assertTrue(SavedSearch.objects.filter(pk=saved.pk).exists())
+
+    def test_imported_data_is_visible_in_search_and_detail_flows(self):
+        self.run_import()
+
+        list_response = self.client.get(reverse("scouting:player_list"), {"name": "Muhammad"})
+        self.assertEqual(list_response.status_code, 200)
+        self.assertContains(list_response, "Muhammad-Ali Abdur-Rahkman")
+
+        player = Player.objects.get(full_name="Muhammad-Ali Abdur-Rahkman")
+        detail_response = self.client.get(reverse("scouting:player_detail", args=[player.id]))
+        self.assertEqual(detail_response.status_code, 200)
+        self.assertContains(detail_response, "Muhammad-Ali Abdur-Rahkman")
+        self.assertContains(detail_response, "PTS 19.5")
+
+    def test_importer_fails_cleanly_for_malformed_fixture(self):
+        broken_fixture = Path(__file__).resolve().parent / "sample_data" / "imports" / "lba_public_broken_fixture.json"
+        broken_fixture.write_text("{\"categories\": {\"points\": {\"stats\": [{\"name\": \"OnlyName\"}]}}}", encoding="utf-8")
+        try:
+            with self.assertRaises(CommandError):
+                call_command(self.COMMAND_NAME, fixture=str(broken_fixture), season=2025)
+        finally:
+            if broken_fixture.exists():
+                broken_fixture.unlink()
+
+
 class FavoritePlayerViewsTests(TestCase):
     @classmethod
     def setUpTestData(cls):