feat(api,userbot,frontend): add accounts from the web ui and isolate per-account settings

backend/src/utils/policy/repository.py

@@ -110,10 +110,24 @@ async def get_policy(pool: asyncpg.Pool, policy_id: int) -> PolicyRecord | None:
     return PolicyRecord(**dict(row)) if row else None
 
 
+async def find_policy(
+    pool: asyncpg.Pool, account_id: int, scope_type: ScopeType, scope_id: int | None
+) -> PolicyRecord | None:
+    row = await pool.fetchrow(
+        "SELECT * FROM capture_policy WHERE account_id = $1 AND scope_type = $2 "
+        "AND scope_id IS NOT DISTINCT FROM $3",
+        account_id,
+        scope_type.value,
+        scope_id,
+    )
+    return PolicyRecord(**dict(row)) if row else None
+
+
 async def list_policies(pool: asyncpg.Pool, account_id: int) -> list[PolicyRecord]:
     rows = await pool.fetch(
-        "SELECT * FROM capture_policy WHERE account_id = $1 OR account_id IS NULL "
-        "ORDER BY scope_type, scope_id",
+        "SELECT DISTINCT ON (scope_type, scope_id) * FROM capture_policy "
+        "WHERE account_id = $1 OR account_id IS NULL "
+        "ORDER BY scope_type, scope_id, account_id NULLS LAST",
         account_id,
     )
     return [PolicyRecord(**dict(row)) for row in rows]
@@ -131,6 +145,22 @@ async def update_policy(
     return PolicyRecord(**dict(row)) if row else None
 
 
+async def override_policy(
+    pool: asyncpg.Pool, policy_id: int, account_id: int, toggles: CaptureToggles
+) -> PolicyRecord | None:
+    record = await get_policy(pool, policy_id)
+    if record is None:
+        return None
+    if record.account_id == account_id:
+        return await update_policy(pool, policy_id, toggles)
+    existing = await find_policy(pool, account_id, record.scope_type, record.scope_id)
+    if existing is not None:
+        return await update_policy(pool, existing.id, toggles)
+    return await create_policy(
+        pool, account_id, record.scope_type, record.scope_id, toggles
+    )
+
+
 async def delete_policy(pool: asyncpg.Pool, policy_id: int) -> bool:
     result = await pool.execute("DELETE FROM capture_policy WHERE id = $1", policy_id)
     return result.endswith("1")
@@ -138,7 +168,8 @@ async def delete_policy(pool: asyncpg.Pool, policy_id: int) -> bool:
 
 async def load_policy_set(pool: asyncpg.Pool, account_id: int) -> PolicySet:
     rows = await pool.fetch(
-        "SELECT * FROM capture_policy WHERE account_id = $1 OR account_id IS NULL",
+        "SELECT * FROM capture_policy WHERE account_id = $1 OR account_id IS NULL "
+        "ORDER BY account_id NULLS FIRST",
         account_id,
     )
     policies = PolicySet()