feat: convert network-topology to a full plugin (B1)

src/backend/database/db/index.ts

@@ -1745,30 +1745,6 @@ const migrateSchema = () => {
     }
   }
 
-  try {
-    sqlite
-      .prepare("SELECT id FROM network_topology LIMIT 1")
-      .get();
-  } catch {
-    try {
-      sqlite.exec(`
-        CREATE TABLE IF NOT EXISTS network_topology (
-          id INTEGER PRIMARY KEY AUTOINCREMENT,
-          user_id TEXT NOT NULL,
-          topology TEXT,
-          created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
-          updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
-          FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
-        );
-      `);
-    } catch (createError) {
-      databaseLogger.warn("Failed to create network_topology table", {
-        operation: "schema_migration",
-        error: createError,
-      });
-    }
-  }
-
   try {
     sqlite.prepare("SELECT role_id FROM host_access LIMIT 1").get();
   } catch {

src/backend/database/db/schema.mysql.ts

@@ -718,20 +718,6 @@ export const commandHistory = mysqlTable(
   ],
 );
 
-export const networkTopology = mysqlTable("network_topology", {
-  id: int("id").autoincrement().primaryKey(),
-  userId: varchar("user_id", { length: 255 })
-    .notNull()
-    .references(() => users.id, { onDelete: "cascade" }),
-  topology: text("topology"),
-  createdAt: varchar("created_at", { length: 255 })
-    .notNull()
-    .default(sql`(CURRENT_TIMESTAMP)`),
-  updatedAt: varchar("updated_at", { length: 255 })
-    .notNull()
-    .default(sql`(CURRENT_TIMESTAMP)`),
-});
-
 export const hostAccess = mysqlTable(
   "host_access",
   {

src/backend/database/db/schema.pg.ts

@@ -719,20 +719,6 @@ export const commandHistory = pgTable(
   ],
 );
 
-export const networkTopology = pgTable("network_topology", {
-  id: serial("id").primaryKey(),
-  userId: varchar("user_id", { length: 255 })
-    .notNull()
-    .references(() => users.id, { onDelete: "cascade" }),
-  topology: text("topology"),
-  createdAt: varchar("created_at", { length: 255 })
-    .notNull()
-    .default(sql`CURRENT_TIMESTAMP`),
-  updatedAt: varchar("updated_at", { length: 255 })
-    .notNull()
-    .default(sql`CURRENT_TIMESTAMP`),
-});
-
 export const hostAccess = pgTable(
   "host_access",
   {

src/backend/database/db/schema.ts

@@ -711,20 +711,6 @@ export const commandHistory = sqliteTable(
   ],
 );
 
-export const networkTopology = sqliteTable("network_topology", {
-  id: integer("id").primaryKey({ autoIncrement: true }),
-  userId: text("user_id")
-    .notNull()
-    .references(() => users.id, { onDelete: "cascade" }),
-  topology: text("topology"),
-  createdAt: text("created_at")
-    .notNull()
-    .default(sql`CURRENT_TIMESTAMP`),
-  updatedAt: text("updated_at")
-    .notNull()
-    .default(sql`CURRENT_TIMESTAMP`),
-});
-
 export const hostAccess = sqliteTable(
   "host_access",
   {

src/backend/database/repositories/factory.ts

@@ -29,7 +29,6 @@ import { HostResolutionRepository } from "./host-resolution-repository.js";
 import { HostSidebarPreferenceRepository } from "./host-sidebar-preference-repository.js";
 import { CredentialSidebarPreferenceRepository } from "./credential-sidebar-preference-repository.js";
 import { UiPreferenceRepository } from "./ui-preference-repository.js";
-import { NetworkTopologyRepository } from "./network-topology-repository.js";
 import { OpenTabRepository } from "./open-tab-repository.js";
 import { OpksshTokenRepository } from "./opkssh-token-repository.js";
 import { PluginRepository } from "./plugin-repository.js";
@@ -352,13 +351,6 @@ export function createCurrentUiPreferenceRepository(): UiPreferenceRepository {
   );
 }
 
-export function createCurrentNetworkTopologyRepository(): NetworkTopologyRepository {
-  return new NetworkTopologyRepository(
-    createCurrentRepositoryContext(),
-    createCurrentRepositoryWriteHook("network_topology_repository_write"),
-  );
-}
-
 export function createCurrentOpenTabRepository(): OpenTabRepository {
   return new OpenTabRepository(
     createCurrentRepositoryContext(),

src/backend/database/repositories/network-topology-repository.ts

@@ -1,63 +0,0 @@
-import { eq } from "drizzle-orm";
-import { networkTopology } from "../db/schema.js";
-import type { DatabaseContext } from "./database-context.js";
-import { rowsAffected } from "./mutation-result.js";
-
-export type NetworkTopologyRecord = typeof networkTopology.$inferSelect;
-
-export class NetworkTopologyRepository {
-  constructor(
-    private readonly context: DatabaseContext,
-    private readonly onWrite?: () => void | Promise<void>,
-  ) {}
-
-  async findByUserId(userId: string): Promise<NetworkTopologyRecord | null> {
-    const rows = await this.context.drizzle
-      .select()
-      .from(networkTopology)
-      .where(eq(networkTopology.userId, userId))
-      .limit(1);
-
-    return rows[0] ?? null;
-  }
-
-  async upsertForUser(
-    userId: string,
-    topology: string,
-    updatedAt = new Date().toISOString(),
-  ): Promise<void> {
-    const existing = await this.findByUserId(userId);
-
-    if (existing) {
-      await this.context.drizzle
-        .update(networkTopology)
-        .set({ topology, updatedAt })
-        .where(eq(networkTopology.userId, userId));
-      await this.afterWrite();
-      return;
-    }
-
-    await this.context.drizzle.insert(networkTopology).values({
-      userId,
-      topology,
-      updatedAt,
-    });
-    await this.afterWrite();
-  }
-
-  async deleteByUserId(userId: string): Promise<number> {
-    const result = await this.context.drizzle
-      .delete(networkTopology)
-      .where(eq(networkTopology.userId, userId));
-
-    if (rowsAffected(result) > 0) {
-      await this.afterWrite();
-    }
-
-    return rowsAffected(result);
-  }
-
-  private async afterWrite(): Promise<void> {
-    await this.onWrite?.();
-  }
-}

src/backend/database/routes/delete-user-data.ts

@@ -19,7 +19,6 @@ import {
   createCurrentHostSidebarPreferenceRepository,
   createCurrentCredentialSidebarPreferenceRepository,
   createCurrentUiPreferenceRepository,
-  createCurrentNetworkTopologyRepository,
   createCurrentOpksshTokenRepository,
   createCurrentOpenTabRepository,
   createCurrentRecentActivityRepository,
@@ -110,7 +109,6 @@ export async function deleteUserAndRelatedData(
     await createCurrentHostRepository().deleteByUserId(userId);
     await createCurrentCredentialRepository().deleteByUserId(userId);
 
-    await createCurrentNetworkTopologyRepository().deleteByUserId(userId);
     await createCurrentDashboardServiceLinkRepository().deleteByUserId(userId);
     await createCurrentHomepageItemRepository().deleteByUserId(userId);
     await createCurrentHomepageLayoutRepository().deleteByUserId(userId);

src/backend/database/routes/sync-entities.ts

@@ -4,12 +4,11 @@
  * These were a hardcoded ENTITY_CONFIG in sync.ts, a SyncEntityType union in
  * the tombstone repository, a REFERENCES map in sync-references.ts and a
  * frozen array in electron/. Four lists that had to agree and had no test
- * saying they did - which is how networkTopology came to be missing from one
- * of them. Now there is one registration per entity and the rest is derived.
+ * saying they did. Now there is one registration per entity and the rest is
+ * derived.
  *
  * The order values reproduce the dependency order the Electron array encoded:
- * anything referenced by another entity syncs first, and networkTopology
- * syncs last because it holds host ids inside a JSON blob.
+ * anything referenced by another entity syncs first.
  */
 
 import {
@@ -22,14 +21,12 @@ import {
   dashboardServiceLinks,
   homepageItems,
   userPreferences,
-  networkTopology,
 } from "../db/schema.js";
 import {
   CORE_OWNER,
   registerEntity,
   listEntities,
 } from "../../plugins/sync-registry.js";
-import { mapTopologyHostIds } from "./sync-references.js";
 
 const CREDENTIAL_REFERENCE = {
   field: "credentialId",
@@ -140,36 +137,6 @@ export function registerCoreSyncEntities(): void {
     singleton: true,
     readOnlyFields: ["storageMode"],
   });
-
-  registerEntity(CORE_OWNER, {
-    type: "networkTopology",
-    table: networkTopology,
-    order: 100,
-    singleton: true,
-    // Host ids live inside the topology JSON rather than in a column, so the
-    // generic reference machinery cannot reach them.
-    serialize: async (row, resolveSyncId) => ({
-      ...row,
-      topology: await mapTopologyHostIds(
-        row.topology as string | null | undefined,
-        async (id) => {
-          const numericId = Number(id);
-          if (!Number.isInteger(numericId)) return null;
-          return resolveSyncId("hosts", numericId);
-        },
-      ),
-    }),
-    deserialize: async (row, resolveId) => ({
-      ...row,
-      topology: await mapTopologyHostIds(
-        row.topology as string | null | undefined,
-        async (syncId) => {
-          const id = await resolveId("hosts", syncId);
-          return id === null ? null : String(id);
-        },
-      ),
-    }),
-  });
 }
 
 /** The tables a reference may point at, derived from the registrations. */

src/backend/database/routes/sync-references.ts

@@ -12,79 +12,6 @@ import { getEntity } from "../../plugins/sync-registry.js";
  */
 export type SyncReferenceEntity = string;
 
-interface TopologyNode {
-  data?: { id?: string; [key: string]: unknown };
-  [key: string]: unknown;
-}
-
-interface TopologyEdge {
-  data?: { source?: string; target?: string; [key: string]: unknown };
-  [key: string]: unknown;
-}
-
-interface Topology {
-  nodes?: TopologyNode[];
-  edges?: TopologyEdge[];
-  [key: string]: unknown;
-}
-
-/**
- * Node/edge ids in a topology are either a host's local numeric `id` (as a
- * string) or a client-generated `group-<timestamp>` id. Only the former is
- * meaningful across sides, so translate just those through the mapper and
- * leave group ids untouched. Nodes/edges that fail to resolve (host deleted,
- * or not synced to this side yet) are dropped rather than left dangling.
- */
-export async function mapTopologyHostIds(
-  topologyJson: string | null | undefined,
-  mapId: (id: string) => Promise<string | null>,
-): Promise<string | null> {
-  if (!topologyJson) return topologyJson ?? null;
-
-  let topology: Topology;
-  try {
-    topology = JSON.parse(topologyJson);
-  } catch {
-    return topologyJson;
-  }
-
-  const isGroupId = (id: string) => id.startsWith("group-");
-  const idMap = new Map<string, string | null>();
-
-  const resolve = async (id: string): Promise<string | null> => {
-    if (isGroupId(id)) return id;
-    if (!idMap.has(id)) idMap.set(id, await mapId(id));
-    return idMap.get(id) ?? null;
-  };
-
-  const nodes: TopologyNode[] = [];
-  for (const node of topology.nodes ?? []) {
-    const id = node.data?.id;
-    if (typeof id !== "string") continue;
-    const mapped = await resolve(id);
-    if (mapped === null) continue;
-    nodes.push({ ...node, data: { ...node.data, id: mapped } });
-  }
-
-  const nodeIds = new Set(nodes.map((n) => n.data?.id));
-  const edges: TopologyEdge[] = [];
-  for (const edge of topology.edges ?? []) {
-    const source = edge.data?.source;
-    const target = edge.data?.target;
-    if (typeof source !== "string" || typeof target !== "string") continue;
-    const mappedSource = await resolve(source);
-    const mappedTarget = await resolve(target);
-    if (mappedSource === null || mappedTarget === null) continue;
-    if (!nodeIds.has(mappedSource) || !nodeIds.has(mappedTarget)) continue;
-    edges.push({
-      ...edge,
-      data: { ...edge.data, source: mappedSource, target: mappedTarget },
-    });
-  }
-
-  return JSON.stringify({ ...topology, nodes, edges });
-}
-
 interface SyncReference {
   field: string;
   syncField: string;