KI-AGENT: Matrix durch nativen FEDEO-Chat ersetzen

backend/db/migrations/0070_native_communication_chat.sql

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+ALTER TABLE "communication_rooms" DROP COLUMN IF EXISTS "matrix_room_id";
+ALTER TABLE "communication_rooms" DROP COLUMN IF EXISTS "matrix_alias";
+ALTER TABLE "communication_rooms" DROP COLUMN IF EXISTS "parent_space_room_id";
+
+CREATE TABLE IF NOT EXISTS "communication_room_members" (
+    "room_id" uuid NOT NULL REFERENCES "communication_rooms"("id") ON DELETE cascade,
+    "user_id" uuid NOT NULL REFERENCES "auth_users"("id") ON DELETE cascade,
+    "joined_at" timestamp with time zone DEFAULT now() NOT NULL,
+    CONSTRAINT "communication_room_members_room_id_user_id_pk" PRIMARY KEY ("room_id", "user_id")
+);
+
+CREATE INDEX IF NOT EXISTS "communication_room_members_user_idx"
+    ON "communication_room_members" ("user_id");
+
+CREATE TABLE IF NOT EXISTS "communication_messages" (
+    "id" bigint GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
+    "tenant_id" bigint NOT NULL REFERENCES "tenants"("id") ON DELETE cascade,
+    "room_id" uuid NOT NULL REFERENCES "communication_rooms"("id") ON DELETE cascade,
+    "author_user_id" uuid NOT NULL REFERENCES "auth_users"("id"),
+    "body" text NOT NULL,
+    "created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+
+CREATE INDEX IF NOT EXISTS "communication_messages_room_message_idx"
+    ON "communication_messages" ("room_id", "id");
+CREATE INDEX IF NOT EXISTS "communication_messages_tenant_idx"
+    ON "communication_messages" ("tenant_id");
+
+CREATE TABLE IF NOT EXISTS "communication_room_reads" (
+    "room_id" uuid NOT NULL REFERENCES "communication_rooms"("id") ON DELETE cascade,
+    "user_id" uuid NOT NULL REFERENCES "auth_users"("id") ON DELETE cascade,
+    "last_read_message_id" bigint,
+    "read_at" timestamp with time zone DEFAULT now() NOT NULL,
+    CONSTRAINT "communication_room_reads_room_id_user_id_pk" PRIMARY KEY ("room_id", "user_id")
+);
+
+INSERT INTO "communication_room_members" ("room_id", "user_id")
+SELECT room.id, tenant_user.user_id
+FROM "communication_rooms" room
+JOIN "auth_tenant_users" tenant_user ON tenant_user.tenant_id = room.tenant_id
+WHERE room.type IN ('general', 'room')
+ON CONFLICT DO NOTHING;