feat(member): add distinct filter values for all searchable fields

FiltersType now includes departments, names, emails, studentIds,
phones — each returns SELECT DISTINCT from members table.
Empty values excluded from results.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ImTotem

src/bcsd_api/member/schema.py

@@ -27,3 +27,8 @@ class MemberDetail(MemberResponse):
 class FiltersResponse(BaseModel):
     tracks: list[str]
     statuses: list[str]
+    departments: list[str]
+    names: list[str]
+    emails: list[str]
+    student_ids: list[str]
+    phones: list[str]

src/bcsd_api/member/service.py

@@ -3,7 +3,7 @@
 from bcsd_api.exception import NotFound
 from bcsd_api.filter.base import PagedResponse, apply_filter
 from bcsd_api.filter.members import MemberFilter
-from bcsd_api.tables import statuses, tracks
+from bcsd_api.tables import members, statuses, tracks
 
 from .pg_repository import PgMemberRepository
 from .schema import FiltersResponse, MemberDetail, MemberResponse
@@ -14,6 +14,11 @@ def _names(conn: Connection, table) -> list[str]:
     return [row.name for row in rows]
 
 
+def _distinct(conn: Connection, column) -> list[str]:
+    rows = conn.execute(select(column).distinct().order_by(column))
+    return [row[0] for row in rows if row[0]]
+
+
 def list_members(
     repo: PgMemberRepository, filt: MemberFilter,
 ) -> PagedResponse[MemberResponse]:
@@ -36,4 +41,9 @@ def get_filters(conn: Connection) -> FiltersResponse:
     return FiltersResponse(
         tracks=_names(conn, tracks),
         statuses=_names(conn, statuses),
+        departments=_distinct(conn, members.c.department),
+        names=_distinct(conn, members.c.name),
+        emails=_distinct(conn, members.c.email),
+        student_ids=_distinct(conn, members.c.student_id),
+        phones=_distinct(conn, members.c.phone),
     )

src/bcsd_api/member/types.py

@@ -27,6 +27,11 @@ class MemberDetailType(MemberType):
 class FiltersType:
     tracks: list[str]
     statuses: list[str]
+    departments: list[str]
+    names: list[str]
+    emails: list[str]
+    student_ids: list[str]
+    phones: list[str]
 
 
 @strawberry.type