scaffolded PySwiss microservice: Django 6.0 project at pyswiss/ (core/ settings, apps/charts/), GET /api/chart/ + GET /api/charts/ views, EphemerisSnapshot model + migration, populate_ephemeris management command, 41 ITs (integrated + unit, all green); separate .venv with pyswisseph 2.10.3.2

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pyswiss/apps/charts/apps.py

@@ -0,0 +1,6 @@
+from django.apps import AppConfig
+
+
+class ChartsConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'apps.charts'

pyswiss/apps/charts/calc.py

@@ -0,0 +1,92 @@
+"""
+Core ephemeris calculation logic — shared by views and management commands.
+"""
+from django.conf import settings as django_settings
+import swisseph as swe
+
+
+DEFAULT_HOUSE_SYSTEM = 'O'  # Porphyry
+
+SIGNS = [
+    'Aries', 'Taurus', 'Gemini', 'Cancer', 'Leo', 'Virgo',
+    'Libra', 'Scorpio', 'Sagittarius', 'Capricorn', 'Aquarius', 'Pisces',
+]
+
+SIGN_ELEMENT = {
+    'Aries': 'Fire',  'Leo': 'Fire',   'Sagittarius': 'Fire',
+    'Taurus': 'Earth', 'Virgo': 'Earth', 'Capricorn': 'Earth',
+    'Gemini': 'Air',  'Libra': 'Air',  'Aquarius': 'Air',
+    'Cancer': 'Water', 'Scorpio': 'Water', 'Pisces': 'Water',
+}
+
+PLANET_CODES = {
+    'Sun':     swe.SUN,
+    'Moon':    swe.MOON,
+    'Mercury': swe.MERCURY,
+    'Venus':   swe.VENUS,
+    'Mars':    swe.MARS,
+    'Jupiter': swe.JUPITER,
+    'Saturn':  swe.SATURN,
+    'Uranus':  swe.URANUS,
+    'Neptune': swe.NEPTUNE,
+    'Pluto':   swe.PLUTO,
+}
+
+
+def set_ephe_path():
+    ephe_path = getattr(django_settings, 'SWISSEPH_PATH', None)
+    if ephe_path:
+        swe.set_ephe_path(ephe_path)
+
+
+def get_sign(lon):
+    return SIGNS[int(lon // 30) % 12]
+
+
+def get_julian_day(dt):
+    return swe.julday(
+        dt.year, dt.month, dt.day,
+        dt.hour + dt.minute / 60 + dt.second / 3600,
+    )
+
+
+def get_planet_positions(jd):
+    flag = swe.FLG_SWIEPH | swe.FLG_SPEED
+    planets = {}
+    for name, code in PLANET_CODES.items():
+        pos, _ = swe.calc_ut(jd, code, flag)
+        degree = pos[0]
+        planets[name] = {
+            'sign': get_sign(degree),
+            'degree': degree,
+            'retrograde': pos[3] < 0,
+        }
+    return planets
+
+
+def get_element_counts(planets):
+    sign_counts = {s: 0 for s in SIGNS}
+    counts = {'Fire': 0, 'Water': 0, 'Earth': 0, 'Air': 0}
+
+    for data in planets.values():
+        sign = data['sign']
+        counts[SIGN_ELEMENT[sign]] += 1
+        sign_counts[sign] += 1
+
+    # Time: highest planet concentration in a single sign, minus 1
+    counts['Time'] = max(sign_counts.values()) - 1
+
+    # Space: longest consecutive run of occupied signs (circular), minus 1
+    indices = [i for i, s in enumerate(SIGNS) if sign_counts[s] > 0]
+    max_seq = 0
+    for start in range(len(indices)):
+        seq_len = 1
+        for offset in range(1, len(indices)):
+            if (indices[start] + offset) % len(SIGNS) in indices:
+                seq_len += 1
+            else:
+                break
+        max_seq = max(max_seq, seq_len)
+    counts['Space'] = max_seq - 1
+
+    return counts

pyswiss/apps/charts/management/commands/populate_ephemeris.py

@@ -0,0 +1,49 @@
+from datetime import date, datetime, timedelta, timezone
+
+from django.core.management.base import BaseCommand
+
+from apps.charts.calc import get_element_counts, get_julian_day, get_planet_positions, set_ephe_path
+from apps.charts.models import EphemerisSnapshot
+
+
+class Command(BaseCommand):
+    help = 'Pre-compute ephemeris snapshots for a date range (one per day at noon UTC).'
+
+    def add_arguments(self, parser):
+        parser.add_argument('--date-from', required=True, help='Start date (YYYY-MM-DD)')
+        parser.add_argument('--date-to',   required=True, help='End date (YYYY-MM-DD, inclusive)')
+
+    def handle(self, *args, **options):
+        set_ephe_path()
+
+        date_from = date.fromisoformat(options['date_from'])
+        date_to   = date.fromisoformat(options['date_to'])
+
+        current = date_from
+        count = 0
+        while current <= date_to:
+            dt = datetime(current.year, current.month, current.day,
+                          12, 0, 0, tzinfo=timezone.utc)
+            jd = get_julian_day(dt)
+            planets = get_planet_positions(jd)
+            elements = get_element_counts(planets)
+
+            EphemerisSnapshot.objects.update_or_create(
+                dt=dt,
+                defaults={
+                    'fire':     elements['Fire'],
+                    'water':    elements['Water'],
+                    'earth':    elements['Earth'],
+                    'air':      elements['Air'],
+                    'time_el':  elements['Time'],
+                    'space_el': elements['Space'],
+                    'chart_data': {'planets': planets},
+                },
+            )
+            current += timedelta(days=1)
+            count += 1
+
+        if options['verbosity'] > 0:
+            self.stdout.write(
+                self.style.SUCCESS(f'Created/updated {count} snapshot(s).')
+            )

pyswiss/apps/charts/migrations/0001_initial.py

@@ -0,0 +1,31 @@
+# Generated by Django 6.0.4 on 2026-04-13 20:40
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='EphemerisSnapshot',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('dt', models.DateTimeField(db_index=True, unique=True)),
+                ('fire', models.PositiveSmallIntegerField()),
+                ('water', models.PositiveSmallIntegerField()),
+                ('earth', models.PositiveSmallIntegerField()),
+                ('air', models.PositiveSmallIntegerField()),
+                ('time_el', models.PositiveSmallIntegerField()),
+                ('space_el', models.PositiveSmallIntegerField()),
+                ('chart_data', models.JSONField()),
+            ],
+            options={
+                'ordering': ['dt'],
+            },
+        ),
+    ]

pyswiss/apps/charts/models.py

@@ -0,0 +1,36 @@
+from django.db import models
+
+
+class EphemerisSnapshot(models.Model):
+    """Pre-computed chart data for a single point in time.
+
+    Element counts are stored as denormalised columns for fast DB-level range
+    filtering.  Full planet/house data lives in chart_data (JSONField) for
+    response serialisation.
+    """
+
+    dt = models.DateTimeField(unique=True, db_index=True)
+
+    # Denormalised element counts — indexed for range queries
+    fire = models.PositiveSmallIntegerField()
+    water = models.PositiveSmallIntegerField()
+    earth = models.PositiveSmallIntegerField()
+    air = models.PositiveSmallIntegerField()
+    time_el = models.PositiveSmallIntegerField()
+    space_el = models.PositiveSmallIntegerField()
+
+    # Full chart payload
+    chart_data = models.JSONField()
+
+    class Meta:
+        ordering = ['dt']
+
+    def elements_dict(self):
+        return {
+            'Fire': self.fire,
+            'Water': self.water,
+            'Earth': self.earth,
+            'Air': self.air,
+            'Time': self.time_el,
+            'Space': self.space_el,
+        }

pyswiss/apps/charts/tests/integrated/test_charts_list.py

@@ -0,0 +1,159 @@
+"""
+Integration tests for GET /api/charts/ — ephemeris range/filter queries.
+
+These tests drive the EphemerisSnapshot model and list view.
+Snapshots are created directly in setUp — no live ephemeris calc needed.
+
+Run:
+    pyswiss/.venv/Scripts/python pyswiss/manage.py test pyswiss/apps/charts
+"""
+from django.test import TestCase
+
+from apps.charts.models import EphemerisSnapshot
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+CHART_DATA_STUB = {
+    'planets': {
+        'Sun':     {'sign': 'Capricorn', 'degree': 280.37, 'retrograde': False},
+        'Moon':    {'sign': 'Aries',     'degree': 15.2,   'retrograde': False},
+        'Mercury': {'sign': 'Capricorn', 'degree': 275.1,  'retrograde': False},
+        'Venus':   {'sign': 'Sagittarius','degree': 250.3, 'retrograde': False},
+        'Mars':    {'sign': 'Aquarius',  'degree': 308.6,  'retrograde': False},
+        'Jupiter': {'sign': 'Aries',     'degree': 25.9,   'retrograde': False},
+        'Saturn':  {'sign': 'Taurus',    'degree': 40.5,   'retrograde': False},
+        'Uranus':  {'sign': 'Aquarius',  'degree': 314.2,  'retrograde': False},
+        'Neptune': {'sign': 'Capricorn', 'degree': 303.8,  'retrograde': False},
+        'Pluto':   {'sign': 'Sagittarius','degree': 248.4, 'retrograde': False},
+    },
+    'houses': {'cusps': [0]*12, 'asc': 180.0, 'mc': 90.0},
+}
+
+
+def make_snapshot(dt_str, fire=2, water=2, earth=3, air=2, time_el=1, space_el=3,
+                  chart_data=None):
+    return EphemerisSnapshot.objects.create(
+        dt=dt_str,
+        fire=fire, water=water, earth=earth, air=air,
+        time_el=time_el, space_el=space_el,
+        chart_data=chart_data or CHART_DATA_STUB,
+    )
+
+
+# ---------------------------------------------------------------------------
+# Tests
+# ---------------------------------------------------------------------------
+
+class ChartsListApiTest(TestCase):
+    """GET /api/charts/ — query pre-computed ephemeris snapshots."""
+
+    def setUp(self):
+        make_snapshot('2000-01-01T12:00:00Z', fire=3, water=2, earth=3, air=2)
+        make_snapshot('2000-01-02T12:00:00Z', fire=1, water=4, earth=3, air=2)
+        make_snapshot('2000-01-03T12:00:00Z', fire=2, water=2, earth=4, air=2)
+        # Outside the usual date range — should not appear in filtered results
+        make_snapshot('2001-06-15T12:00:00Z', fire=4, water=1, earth=3, air=2)
+
+    def _get(self, params=None):
+        return self.client.get('/api/charts/', params or {})
+
+    # ── guards ────────────────────────────────────────────────────────────
+
+    def test_charts_returns_400_if_date_from_missing(self):
+        response = self._get({'date_to': '2000-01-31'})
+        self.assertEqual(response.status_code, 400)
+
+    def test_charts_returns_400_if_date_to_missing(self):
+        response = self._get({'date_from': '2000-01-01'})
+        self.assertEqual(response.status_code, 400)
+
+    def test_charts_returns_400_for_invalid_date_from(self):
+        response = self._get({'date_from': 'not-a-date', 'date_to': '2000-01-31'})
+        self.assertEqual(response.status_code, 400)
+
+    def test_charts_returns_400_if_date_to_before_date_from(self):
+        response = self._get({'date_from': '2000-01-31', 'date_to': '2000-01-01'})
+        self.assertEqual(response.status_code, 400)
+
+    # ── response shape ────────────────────────────────────────────────────
+
+    def test_charts_returns_200_for_valid_params(self):
+        response = self._get({'date_from': '2000-01-01', 'date_to': '2000-01-31'})
+        self.assertEqual(response.status_code, 200)
+
+    def test_charts_response_is_json(self):
+        response = self._get({'date_from': '2000-01-01', 'date_to': '2000-01-31'})
+        self.assertIn('application/json', response['Content-Type'])
+
+    def test_charts_response_has_results_and_count(self):
+        data = self._get({'date_from': '2000-01-01', 'date_to': '2000-01-31'}).json()
+        self.assertIn('results', data)
+        self.assertIn('count', data)
+
+    def test_each_result_has_dt_and_elements(self):
+        data = self._get({'date_from': '2000-01-01', 'date_to': '2000-01-31'}).json()
+        for result in data['results']:
+            with self.subTest(dt=result.get('dt')):
+                self.assertIn('dt', result)
+                self.assertIn('elements', result)
+                for key in ('Fire', 'Water', 'Earth', 'Air', 'Time', 'Space'):
+                    self.assertIn(key, result['elements'])
+
+    def test_each_result_has_planets(self):
+        data = self._get({'date_from': '2000-01-01', 'date_to': '2000-01-31'}).json()
+        for result in data['results']:
+            with self.subTest(dt=result.get('dt')):
+                self.assertIn('planets', result)
+
+    # ── date range filtering ──────────────────────────────────────────────
+
+    def test_charts_returns_only_snapshots_in_date_range(self):
+        data = self._get({'date_from': '2000-01-01', 'date_to': '2000-01-31'}).json()
+        self.assertEqual(data['count'], 3)
+
+    def test_charts_count_matches_results_length(self):
+        data = self._get({'date_from': '2000-01-01', 'date_to': '2000-12-31'}).json()
+        self.assertEqual(data['count'], len(data['results']))
+
+    def test_charts_date_range_is_inclusive(self):
+        data = self._get({'date_from': '2000-01-01', 'date_to': '2000-01-01'}).json()
+        self.assertEqual(data['count'], 1)
+
+    def test_charts_results_ordered_by_dt(self):
+        data = self._get({'date_from': '2000-01-01', 'date_to': '2000-01-31'}).json()
+        dts = [r['dt'] for r in data['results']]
+        self.assertEqual(dts, sorted(dts))
+
+    # ── element range filtering ───────────────────────────────────────────
+
+    def test_charts_filters_by_fire_min(self):
+        # Only the Jan 1 snapshot has fire=3; Jan 2 has fire=1, Jan 3 has fire=2
+        data = self._get({
+            'date_from': '2000-01-01', 'date_to': '2000-01-31', 'fire_min': 3,
+        }).json()
+        self.assertEqual(data['count'], 1)
+
+    def test_charts_filters_by_water_min(self):
+        # Only the Jan 2 snapshot has water=4
+        data = self._get({
+            'date_from': '2000-01-01', 'date_to': '2000-01-31', 'water_min': 4,
+        }).json()
+        self.assertEqual(data['count'], 1)
+
+    def test_charts_filters_by_earth_min(self):
+        # Jan 3 has earth=4; Jan 1 and Jan 2 have earth=3
+        data = self._get({
+            'date_from': '2000-01-01', 'date_to': '2000-01-31', 'earth_min': 4,
+        }).json()
+        self.assertEqual(data['count'], 1)
+
+    def test_charts_multiple_element_filters_are_conjunctive(self):
+        # fire>=2 AND water>=2: Jan 1 (fire=3,water=2) + Jan 3 (fire=2,water=2); not Jan 2 (fire=1)
+        data = self._get({
+            'date_from': '2000-01-01', 'date_to': '2000-01-31',
+            'fire_min': 2, 'water_min': 2,
+        }).json()
+        self.assertEqual(data['count'], 2)

pyswiss/apps/charts/tests/integrated/test_views.py

@@ -0,0 +1,126 @@
+"""
+Integration tests for the PySwiss chart calculation API.
+
+These tests drive the TDD implementation of GET /api/chart/.
+They verify the HTTP contract using Django's test client.
+
+Run:
+    pyswiss/.venv/Scripts/python pyswiss/manage.py test pyswiss/apps/charts
+"""
+from django.test import TestCase
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+# J2000.0 — a well-known reference point: Sun at ~280.37° (Capricorn 10°22')
+J2000 = '2000-01-01T12:00:00Z'
+LONDON = {'lat': 51.5074, 'lon': -0.1278}
+
+
+class ChartApiTest(TestCase):
+    """GET /api/chart/ — calculate a natal chart from datetime + coordinates."""
+
+    def _get(self, params):
+        return self.client.get('/api/chart/', params)
+
+    # ── guards ────────────────────────────────────────────────────────────
+
+    def test_chart_returns_400_if_dt_missing(self):
+        response = self._get({'lat': 51.5074, 'lon': -0.1278})
+        self.assertEqual(response.status_code, 400)
+
+    def test_chart_returns_400_if_lat_missing(self):
+        response = self._get({'dt': J2000, 'lon': -0.1278})
+        self.assertEqual(response.status_code, 400)
+
+    def test_chart_returns_400_if_lon_missing(self):
+        response = self._get({'dt': J2000, 'lat': 51.5074})
+        self.assertEqual(response.status_code, 400)
+
+    def test_chart_returns_400_for_invalid_dt_format(self):
+        response = self._get({'dt': 'not-a-date', **LONDON})
+        self.assertEqual(response.status_code, 400)
+
+    def test_chart_returns_400_for_out_of_range_lat(self):
+        response = self._get({'dt': J2000, 'lat': 999, 'lon': -0.1278})
+        self.assertEqual(response.status_code, 400)
+
+    # ── response shape ────────────────────────────────────────────────────
+
+    def test_chart_returns_200_for_valid_params(self):
+        response = self._get({'dt': J2000, **LONDON})
+        self.assertEqual(response.status_code, 200)
+
+    def test_chart_response_is_json(self):
+        response = self._get({'dt': J2000, **LONDON})
+        self.assertIn('application/json', response['Content-Type'])
+
+    def test_chart_returns_all_ten_planets(self):
+        data = self._get({'dt': J2000, **LONDON}).json()
+        expected = {
+            'Sun', 'Moon', 'Mercury', 'Venus', 'Mars',
+            'Jupiter', 'Saturn', 'Uranus', 'Neptune', 'Pluto',
+        }
+        self.assertEqual(set(data['planets'].keys()), expected)
+
+    def test_each_planet_has_sign_degree_and_retrograde(self):
+        data = self._get({'dt': J2000, **LONDON}).json()
+        for name, planet in data['planets'].items():
+            with self.subTest(planet=name):
+                self.assertIn('sign', planet)
+                self.assertIn('degree', planet)
+                self.assertIn('retrograde', planet)
+
+    def test_chart_returns_houses(self):
+        data = self._get({'dt': J2000, **LONDON}).json()
+        houses = data['houses']
+        self.assertEqual(len(houses['cusps']), 12)
+        self.assertIn('asc', houses)
+        self.assertIn('mc', houses)
+
+    def test_chart_returns_six_element_counts(self):
+        """Fire/Water/Earth/Air are sign-based counts; Time/Space are emergent."""
+        data = self._get({'dt': J2000, **LONDON}).json()
+        for key in ('Fire', 'Water', 'Earth', 'Air', 'Time', 'Space'):
+            with self.subTest(element=key):
+                self.assertIn(key, data['elements'])
+
+    def test_chart_reports_active_house_system(self):
+        data = self._get({'dt': J2000, **LONDON}).json()
+        self.assertIn('house_system', data)
+
+    # ── calculation correctness ───────────────────────────────────────────
+
+    def test_sun_is_in_capricorn_at_j2000(self):
+        """Regression: Sun at J2000.0 is ~280.37° — Capricorn."""
+        data = self._get({'dt': J2000, **LONDON}).json()
+        sun = data['planets']['Sun']
+        self.assertEqual(sun['sign'], 'Capricorn')
+        self.assertAlmostEqual(sun['degree'], 280.37, delta=0.1)
+
+    def test_sun_is_not_retrograde(self):
+        """The Sun never goes retrograde."""
+        data = self._get({'dt': J2000, **LONDON}).json()
+        self.assertFalse(data['planets']['Sun']['retrograde'])
+
+    def test_element_counts_sum_to_ten(self):
+        """All 10 planets are assigned to exactly one classical element."""
+        data = self._get({'dt': J2000, **LONDON}).json()
+        classical = sum(
+            data['elements'][e] for e in ('Fire', 'Water', 'Earth', 'Air')
+        )
+        self.assertEqual(classical, 10)
+
+    # ── house system ──────────────────────────────────────────────────────
+
+    def test_default_house_system_is_porphyry(self):
+        """Porphyry ('O') is the project default — no param needed."""
+        data = self._get({'dt': J2000, **LONDON}).json()
+        self.assertEqual(data['house_system'], 'O')
+
+    def test_non_superuser_cannot_override_house_system(self):
+        """House system override is superuser-only; plain requests get 403."""
+        response = self._get({'dt': J2000, **LONDON, 'house_system': 'P'})
+        self.assertEqual(response.status_code, 403)

pyswiss/apps/charts/tests/unit/test_populate_ephemeris.py

@@ -0,0 +1,99 @@
+"""
+Unit tests for the populate_ephemeris management command.
+
+pyswisseph calls are mocked — these tests verify date iteration,
+snapshot persistence, and idempotency without touching the ephemeris.
+
+Run:
+    pyswiss/.venv/Scripts/python pyswiss/manage.py test pyswiss/apps/charts
+"""
+from datetime import datetime, timezone
+from unittest.mock import patch
+
+from django.core.management import call_command
+from django.test import TestCase
+
+from apps.charts.models import EphemerisSnapshot
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+# 10 planets covering Fire×3, Earth×3, Air×2, Water×2 (one per sign)
+# Expected: fire=3, water=2, earth=3, air=2, time=0, space=9
+FAKE_PLANETS = {
+    'Sun':     {'sign': 'Aries',       'degree': 10.0,  'retrograde': False},
+    'Moon':    {'sign': 'Leo',          'degree': 130.0, 'retrograde': False},
+    'Mercury': {'sign': 'Sagittarius',  'degree': 250.0, 'retrograde': False},
+    'Venus':   {'sign': 'Taurus',       'degree': 40.0,  'retrograde': False},
+    'Mars':    {'sign': 'Virgo',        'degree': 160.0, 'retrograde': False},
+    'Jupiter': {'sign': 'Capricorn',    'degree': 280.0, 'retrograde': False},
+    'Saturn':  {'sign': 'Gemini',       'degree': 70.0,  'retrograde': False},
+    'Uranus':  {'sign': 'Aquarius',     'degree': 310.0, 'retrograde': False},
+    'Neptune': {'sign': 'Cancer',       'degree': 100.0, 'retrograde': False},
+    'Pluto':   {'sign': 'Pisces',       'degree': 340.0, 'retrograde': False},
+}
+
+PATCH_TARGET = (
+    'apps.charts.management.commands.populate_ephemeris.get_planet_positions'
+)
+
+
+# ---------------------------------------------------------------------------
+# Tests
+# ---------------------------------------------------------------------------
+
+class PopulateEphemerisCommandTest(TestCase):
+
+    def _run(self, date_from, date_to):
+        with patch(PATCH_TARGET, return_value=FAKE_PLANETS):
+            call_command('populate_ephemeris',
+                         date_from=date_from, date_to=date_to,
+                         verbosity=0)
+
+    # ── date iteration ────────────────────────────────────────────────────
+
+    def test_creates_one_snapshot_per_day(self):
+        self._run('2000-01-01', '2000-01-03')
+        self.assertEqual(EphemerisSnapshot.objects.count(), 3)
+
+    def test_single_day_range_creates_one_snapshot(self):
+        self._run('2000-01-01', '2000-01-01')
+        self.assertEqual(EphemerisSnapshot.objects.count(), 1)
+
+    def test_snapshots_are_at_noon_utc(self):
+        self._run('2000-01-01', '2000-01-01')
+        snap = EphemerisSnapshot.objects.get()
+        self.assertEqual(snap.dt, datetime(2000, 1, 1, 12, 0, 0, tzinfo=timezone.utc))
+
+    # ── idempotency ───────────────────────────────────────────────────────
+
+    def test_rerunning_does_not_create_duplicates(self):
+        self._run('2000-01-01', '2000-01-03')
+        self._run('2000-01-01', '2000-01-03')
+        self.assertEqual(EphemerisSnapshot.objects.count(), 3)
+
+    def test_overlapping_ranges_do_not_duplicate(self):
+        self._run('2000-01-01', '2000-01-03')
+        self._run('2000-01-02', '2000-01-05')
+        self.assertEqual(EphemerisSnapshot.objects.count(), 5)
+
+    # ── element counts ────────────────────────────────────────────────────
+
+    def test_element_counts_are_persisted(self):
+        self._run('2000-01-01', '2000-01-01')
+        snap = EphemerisSnapshot.objects.get()
+        self.assertEqual(snap.fire,  3)
+        self.assertEqual(snap.water, 2)
+        self.assertEqual(snap.earth, 3)
+        self.assertEqual(snap.air,   2)
+        self.assertEqual(snap.time_el,  0)
+        self.assertEqual(snap.space_el, 9)
+
+    # ── chart_data payload ────────────────────────────────────────────────
+
+    def test_chart_data_contains_planets(self):
+        self._run('2000-01-01', '2000-01-01')
+        snap = EphemerisSnapshot.objects.get()
+        self.assertEqual(snap.chart_data['planets'], FAKE_PLANETS)

pyswiss/apps/charts/urls.py

@@ -0,0 +1,7 @@
+from django.urls import path
+from . import views
+
+urlpatterns = [
+    path('chart/', views.chart, name='chart'),
+    path('charts/', views.charts_list, name='charts_list'),
+]

pyswiss/apps/charts/views.py

@@ -0,0 +1,110 @@
+from datetime import datetime, timezone
+
+from django.http import HttpResponse, JsonResponse
+
+import swisseph as swe
+
+from .calc import (
+    DEFAULT_HOUSE_SYSTEM,
+    get_element_counts,
+    get_julian_day,
+    get_planet_positions,
+    set_ephe_path,
+)
+from .models import EphemerisSnapshot
+
+
+def chart(request):
+    dt_str = request.GET.get('dt')
+    lat_str = request.GET.get('lat')
+    lon_str = request.GET.get('lon')
+
+    if not dt_str or lat_str is None or lon_str is None:
+        return HttpResponse(status=400)
+
+    try:
+        dt = datetime.fromisoformat(dt_str.replace('Z', '+00:00'))
+    except ValueError:
+        return HttpResponse(status=400)
+
+    try:
+        lat = float(lat_str)
+        lon = float(lon_str)
+    except ValueError:
+        return HttpResponse(status=400)
+
+    if not (-90 <= lat <= 90):
+        return HttpResponse(status=400)
+
+    house_system_param = request.GET.get('house_system')
+    if house_system_param is not None:
+        if not (hasattr(request, 'user') and request.user.is_authenticated
+                and request.user.is_superuser):
+            return HttpResponse(status=403)
+        house_system = house_system_param
+    else:
+        house_system = DEFAULT_HOUSE_SYSTEM
+
+    set_ephe_path()
+
+    jd = get_julian_day(dt)
+    planets = get_planet_positions(jd)
+
+    cusps, ascmc = swe.houses(jd, lat, lon, house_system.encode())
+    houses = {
+        'cusps': list(cusps),
+        'asc': ascmc[0],
+        'mc': ascmc[1],
+    }
+
+    return JsonResponse({
+        'planets': planets,
+        'houses': houses,
+        'elements': get_element_counts(planets),
+        'house_system': house_system,
+    })
+
+
+def charts_list(request):
+    date_from_str = request.GET.get('date_from')
+    date_to_str = request.GET.get('date_to')
+
+    if not date_from_str or not date_to_str:
+        return HttpResponse(status=400)
+
+    try:
+        date_from = datetime.strptime(date_from_str, '%Y-%m-%d').replace(
+            tzinfo=timezone.utc)
+        date_to = datetime.strptime(date_to_str, '%Y-%m-%d').replace(
+            hour=23, minute=59, second=59, tzinfo=timezone.utc)
+    except ValueError:
+        return HttpResponse(status=400)
+
+    if date_to < date_from:
+        return HttpResponse(status=400)
+
+    qs = EphemerisSnapshot.objects.filter(dt__gte=date_from, dt__lte=date_to)
+
+    element_fields = {
+        'fire_min': 'fire', 'water_min': 'water',
+        'earth_min': 'earth', 'air_min': 'air',
+        'time_min': 'time_el', 'space_min': 'space_el',
+    }
+    for param, field in element_fields.items():
+        value = request.GET.get(param)
+        if value is not None:
+            try:
+                qs = qs.filter(**{f'{field}__gte': int(value)})
+            except ValueError:
+                return HttpResponse(status=400)
+
+    results = [
+        {
+            'dt': snap.dt.isoformat(),
+            'elements': snap.elements_dict(),
+            'planets': snap.chart_data.get('planets', {}),
+        }
+        for snap in qs
+    ]
+
+    return JsonResponse({'results': results, 'count': len(results)})

pyswiss/core/settings.py

@@ -0,0 +1,38 @@
+import os
+from pathlib import Path
+
+BASE_DIR = Path(__file__).resolve().parent.parent
+
+SECRET_KEY = 'pyswiss-dev-only-key-replace-in-production'
+DEBUG = True
+ALLOWED_HOSTS = ['*']
+
+INSTALLED_APPS = [
+    'django.contrib.contenttypes',
+    'django.contrib.auth',
+    'apps.charts',
+]
+
+ROOT_URLCONF = 'core.urls'
+
+DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.sqlite3',
+        'NAME': BASE_DIR / 'db.sqlite3',
+    }
+}
+
+DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
+
+STATIC_URL = '/static/'
+MEDIA_URL = '/media/'
+
+USE_TZ = True
+TIME_ZONE = 'UTC'
+
+# Swiss Ephemeris data files.
+# Override via SWISSEPH_PATH env var on staging/production.
+SWISSEPH_PATH = os.environ.get(
+    'SWISSEPH_PATH',
+    r'D:\OneDrive\Desktop\potentium\implicateOrder\libraries\swisseph-master\ephe',
+)

pyswiss/core/urls.py

@@ -0,0 +1,5 @@
+from django.urls import path, include
+
+urlpatterns = [
+    path('api/', include('apps.charts.urls')),
+]

pyswiss/manage.py

@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+import os
+import sys
+
+
+def main():
+    os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'core.settings')
+    try:
+        from django.core.management import execute_from_command_line
+    except ImportError as exc:
+        raise ImportError(
+            "Couldn't import Django. Are you sure it's installed and available "
+            "on your PYTHONPATH environment variable? Did you forget to activate "
+            "a virtual environment?"
+        ) from exc
+    execute_from_command_line(sys.argv)
+
+
+if __name__ == '__main__':
+    main()

pyswiss/requirements.txt

@@ -0,0 +1,2 @@
+django==6.0.4
+pyswisseph==2.10.3.2