feat: convert tmux monitoring into a plugin (B10)

src/backend/utils/crypto-migration/tmux-monitor-settings-migration.ts

@@ -0,0 +1,84 @@
+/**
+ * Moves the tmux monitor host column into the tmux-monitor plugin's host-scope
+ * settings, before the column is dropped from ssh_data.
+ *
+ * Idempotent: skips a host that already has a tmux-monitor settings row, so it
+ * is safe to run on every boot. Lossless: reads straight off the still-present
+ * ssh_data column, so it must run and finish before that column is ever
+ * dropped from schema.ts.
+ */
+
+import { sql } from "drizzle-orm";
+import { databaseLogger } from "../logger.js";
+import { getDb } from "../../database/db/index.js";
+import { createCurrentPluginSettingsRepository } from "../../database/repositories/factory.js";
+
+export interface TmuxMonitorSettingsMigrationResult {
+  moved: number;
+  skipped: number;
+}
+
+interface LegacyTmuxMonitorRow {
+  id: number;
+  enable_tmux_monitor: number | boolean | null;
+}
+
+export async function runTmuxMonitorSettingsMigration(): Promise<TmuxMonitorSettingsMigrationResult> {
+  const result: TmuxMonitorSettingsMigrationResult = { moved: 0, skipped: 0 };
+
+  try {
+    const drizzleDb = getDb();
+    // Raw SQL, not the typed schema, so this keeps working once schema.ts
+    // stops declaring this column. The plugin's enable switch defaults to
+    // off, matching the old column's default, so only hosts that turned it
+    // on need a row.
+    const rows = await drizzleDb.all<LegacyTmuxMonitorRow>(sql`
+      SELECT id, enable_tmux_monitor
+      FROM ssh_data
+      WHERE enable_tmux_monitor = true
+    `);
+
+    if (rows.length === 0) return result;
+
+    const pluginSettingsRepository = createCurrentPluginSettingsRepository();
+
+    for (const row of rows) {
+      const scopeId = String(row.id);
+      const existing = await pluginSettingsRepository.get(
+        "tmux-monitor",
+        "host",
+        scopeId,
+        "enableTmuxMonitor",
+      );
+      if (existing && existing.value !== null) {
+        result.skipped++;
+        continue;
+      }
+
+      await pluginSettingsRepository.set(
+        "tmux-monitor",
+        "host",
+        scopeId,
+        "enableTmuxMonitor",
+        JSON.stringify(!!row.enable_tmux_monitor),
+      );
+      result.moved++;
+    }
+
+    if (result.moved > 0) {
+      databaseLogger.info(
+        `Moved tmux monitor settings for ${result.moved} host(s) into plugin settings`,
+        { operation: "tmux_monitor_settings_migration", moved: result.moved },
+      );
+    }
+  } catch (error) {
+    // A failed migration must not stop the backend. Hosts simply keep the
+    // monitor off, the plugin's default.
+    databaseLogger.warn("Tmux monitor settings migration failed", {
+      operation: "tmux_monitor_settings_migration",
+      error: error instanceof Error ? error.message : String(error),
+    });
+  }
+
+  return result;
+}