feat(sources): strukturierte Klassifikation (Politik/Medientyp/Reliability/Alignments)

- Neue sources-Spalten: political_orientation (7+2 Stufen), media_type (20),
  reliability (5+1), state_affiliated, country_code, classification_source,
  classified_at sowie proposed_*-Spalten fuer LLM-Vorschlaege.
- Neue source_alignments-Tabelle fuer Mehrfach-Tagging geopolitischer Naehe
  (prorussisch, proiranisch, prowestlich, ...).
- API-Filter: ?political_orientation, ?media_type, ?reliability,
  ?state_affiliated, ?alignment.
- create/update_source nehmen alignments[] entgegen und setzen
  classification_source automatisch auf 'manual' bei Klassifikations-Edits.

Backwards-kompatibel: bestehendes bias/language/category bleibt unveraendert,
Default fuer Bestandsquellen ist classification_source = 'legacy'.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/database.py

@@ -158,7 +158,31 @@ CREATE TABLE IF NOT EXISTS sources (
     article_count INTEGER DEFAULT 0,
     last_seen_at TIMESTAMP,
     created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-    tenant_id INTEGER REFERENCES organizations(id)
+    tenant_id INTEGER REFERENCES organizations(id),
+    language TEXT,
+    bias TEXT,
+    political_orientation TEXT DEFAULT 'na',
+    media_type TEXT DEFAULT 'sonstige',
+    reliability TEXT DEFAULT 'na',
+    state_affiliated INTEGER DEFAULT 0,
+    country_code TEXT,
+    classification_source TEXT DEFAULT 'legacy',
+    classified_at TIMESTAMP,
+    proposed_political_orientation TEXT,
+    proposed_media_type TEXT,
+    proposed_reliability TEXT,
+    proposed_state_affiliated INTEGER,
+    proposed_country_code TEXT,
+    proposed_alignments_json TEXT,
+    proposed_confidence REAL,
+    proposed_reasoning TEXT,
+    proposed_at TIMESTAMP
+);
+
+CREATE TABLE IF NOT EXISTS source_alignments (
+    source_id INTEGER NOT NULL REFERENCES sources(id) ON DELETE CASCADE,
+    alignment TEXT NOT NULL,
+    PRIMARY KEY (source_id, alignment)
 );
 
 CREATE TABLE IF NOT EXISTS notifications (
@@ -611,6 +635,57 @@ async def init_db():
             await db.execute("ALTER TABLE sources ADD COLUMN tenant_id INTEGER REFERENCES organizations(id)")
             await db.commit()
 
+        # Migration: language + bias (Freitext, schon laenger im Einsatz, Schema-Lueck schliessen)
+        if "language" not in src_columns:
+            await db.execute("ALTER TABLE sources ADD COLUMN language TEXT")
+            await db.commit()
+        if "bias" not in src_columns:
+            await db.execute("ALTER TABLE sources ADD COLUMN bias TEXT")
+            await db.commit()
+
+        # Migration: strukturierte Klassifikations-Spalten fuer sources
+        for col, ddl in [
+            ("political_orientation", "ALTER TABLE sources ADD COLUMN political_orientation TEXT DEFAULT 'na'"),
+            ("media_type", "ALTER TABLE sources ADD COLUMN media_type TEXT DEFAULT 'sonstige'"),
+            ("reliability", "ALTER TABLE sources ADD COLUMN reliability TEXT DEFAULT 'na'"),
+            ("state_affiliated", "ALTER TABLE sources ADD COLUMN state_affiliated INTEGER DEFAULT 0"),
+            ("country_code", "ALTER TABLE sources ADD COLUMN country_code TEXT"),
+            ("classification_source", "ALTER TABLE sources ADD COLUMN classification_source TEXT DEFAULT 'legacy'"),
+            ("classified_at", "ALTER TABLE sources ADD COLUMN classified_at TIMESTAMP"),
+            ("proposed_political_orientation", "ALTER TABLE sources ADD COLUMN proposed_political_orientation TEXT"),
+            ("proposed_media_type", "ALTER TABLE sources ADD COLUMN proposed_media_type TEXT"),
+            ("proposed_reliability", "ALTER TABLE sources ADD COLUMN proposed_reliability TEXT"),
+            ("proposed_state_affiliated", "ALTER TABLE sources ADD COLUMN proposed_state_affiliated INTEGER"),
+            ("proposed_country_code", "ALTER TABLE sources ADD COLUMN proposed_country_code TEXT"),
+            ("proposed_alignments_json", "ALTER TABLE sources ADD COLUMN proposed_alignments_json TEXT"),
+            ("proposed_confidence", "ALTER TABLE sources ADD COLUMN proposed_confidence REAL"),
+            ("proposed_reasoning", "ALTER TABLE sources ADD COLUMN proposed_reasoning TEXT"),
+            ("proposed_at", "ALTER TABLE sources ADD COLUMN proposed_at TIMESTAMP"),
+        ]:
+            if col not in src_columns:
+                await db.execute(ddl)
+                await db.commit()
+        if any(c not in src_columns for c in ("political_orientation", "media_type", "reliability")):
+            logger.info("Migration: Klassifikations-Spalten zu sources hinzugefuegt")
+
+        # Migration: source_alignments-Tabelle (Mehrfach-Tags fuer geopolitische Naehe)
+        cursor = await db.execute(
+            "SELECT name FROM sqlite_master WHERE type='table' AND name='source_alignments'"
+        )
+        if not await cursor.fetchone():
+            await db.executescript(
+                """
+                CREATE TABLE source_alignments (
+                    source_id INTEGER NOT NULL REFERENCES sources(id) ON DELETE CASCADE,
+                    alignment TEXT NOT NULL,
+                    PRIMARY KEY (source_id, alignment)
+                );
+                CREATE INDEX IF NOT EXISTS idx_source_alignments_alignment ON source_alignments(alignment);
+                """
+            )
+            await db.commit()
+            logger.info("Migration: source_alignments-Tabelle erstellt")
+
         # Migration: tenant_id fuer notifications
         cursor = await db.execute("PRAGMA table_info(notifications)")
         notif_columns = [row[1] for row in await cursor.fetchall()]