fix: enum 写入 PG 用 value 而非 name

Source/SourceKind、UserRole、SubscriptionMatch 三个 enum 改用 values_callable
保证 PG 看到 'rss' / 'owner' / 'any' 等小写 value,而非 'RSS' 大写 name。
seed_sources 同步改为显式字符串。

backend/app/models/source.py

@@ -32,7 +32,11 @@ class Source(Base):
     name: Mapped[str] = mapped_column(String(128), nullable=False)
     slug: Mapped[str] = mapped_column(String(128), unique=True, index=True, nullable=False)
     kind: Mapped[SourceKind] = mapped_column(
-        Enum(SourceKind, name="source_kind"),
+        Enum(
+            SourceKind,
+            name="source_kind",
+            values_callable=lambda x: [e.value for e in x],
+        ),
         default=SourceKind.RSS,
         nullable=False,
     )

backend/app/models/subscription.py

@@ -34,7 +34,11 @@ class Subscription(Base):
     keyword: Mapped[str] = mapped_column(String(255), nullable=False)
     # 简单关键词,匹配走 ILIKE '%kw%';后续可加 regex/lucene
     match_in: Mapped[SubscriptionMatch] = mapped_column(
-        Enum(SubscriptionMatch, name="subscription_match"),
+        Enum(
+            SubscriptionMatch,
+            name="subscription_match",
+            values_callable=lambda x: [e.value for e in x],
+        ),
         default=SubscriptionMatch.ANY,
         nullable=False,
     )

backend/app/models/user.py

@@ -26,7 +26,11 @@ class User(Base):
     email: Mapped[str | None] = mapped_column(String(255), unique=True, index=True)
     password_hash: Mapped[str] = mapped_column(String(255), nullable=False)
     role: Mapped[UserRole] = mapped_column(
-        Enum(UserRole, name="user_role"),
+        Enum(
+            UserRole,
+            name="user_role",
+            values_callable=lambda x: [e.value for e in x],
+        ),
         default=UserRole.MEMBER,
         nullable=False,
     )

backend/app/scripts/seed_sources.py

@@ -18,13 +18,14 @@ from sqlalchemy.dialects.postgresql import insert as pg_insert
 from sqlalchemy.exc import IntegrityError
 
 from app.database import AsyncSessionLocal
-from app.models.source import Source, SourceKind
+from app.models.source import Source
 
+# 用字符串避免 SQLAlchemy 把 enum 写成 name(大写)而非 value(小写)
 SEEDS = [
     {
         "name": "Reuters World",
         "slug": "reuters-world",
-        "kind": SourceKind.RSS,
+        "kind": "rss",
         "url": "https://feeds.reuters.com/Reuters/worldNews",
         "region": "global",
         "language_src": "en",
@@ -36,7 +37,7 @@ SEEDS = [
     {
         "name": "BBC World",
         "slug": "bbc-world",
-        "kind": SourceKind.RSS,
+        "kind": "rss",
         "url": "https://feeds.bbci.co.uk/news/world/rss.xml",
         "region": "global",
         "language_src": "en",
@@ -48,7 +49,7 @@ SEEDS = [
     {
         "name": "Al Jazeera",
         "slug": "aljazeera",
-        "kind": SourceKind.RSS,
+        "kind": "rss",
         "url": "https://www.aljazeera.com/xml/rss/all.xml",
         "region": "mena",
         "language_src": "en",
@@ -60,7 +61,7 @@ SEEDS = [
     {
         "name": "NHK World",
         "slug": "nhk-world",
-        "kind": SourceKind.RSS,
+        "kind": "rss",
         "url": "https://www3.nhk.or.jp/rss/news/cat0.xml",
         "region": "asia",
         "language_src": "en",
@@ -72,7 +73,7 @@ SEEDS = [
     {
         "name": "DW (Deutsche Welle)",
         "slug": "dw",
-        "kind": SourceKind.RSS,
+        "kind": "rss",
         "url": "https://rss.dw.com/xml/rss-en-all",
         "region": "eu",
         "language_src": "en",