Add company overview skeleton and cache

lib/server/db/schema.ts

@@ -607,6 +607,20 @@ export const companyFinancialBundle = sqliteTable('company_financial_bundle', {
   companyFinancialBundleTickerIndex: index('company_financial_bundle_ticker_idx').on(table.ticker, table.updated_at)
 }));
 
+export const companyOverviewCache = sqliteTable('company_overview_cache', {
+  id: integer('id').primaryKey({ autoIncrement: true }),
+  user_id: text('user_id').notNull().references(() => user.id, { onDelete: 'cascade' }),
+  ticker: text('ticker').notNull(),
+  cache_version: integer('cache_version').notNull(),
+  source_signature: text('source_signature').notNull(),
+  payload: text('payload', { mode: 'json' }).$type<Record<string, unknown>>().notNull(),
+  created_at: text('created_at').notNull(),
+  updated_at: text('updated_at').notNull()
+}, (table) => ({
+  companyOverviewCacheUnique: uniqueIndex('company_overview_cache_uidx').on(table.user_id, table.ticker),
+  companyOverviewCacheLookupIndex: index('company_overview_cache_lookup_idx').on(table.user_id, table.ticker, table.updated_at)
+}));
+
 export const filingLink = sqliteTable('filing_link', {
   id: integer('id').primaryKey({ autoIncrement: true }),
   filing_id: integer('filing_id').notNull().references(() => filing.id, { onDelete: 'cascade' }),
@@ -831,6 +845,7 @@ export const appSchema = {
   filingTaxonomyFact,
   filingTaxonomyMetricValidation,
   companyFinancialBundle,
+  companyOverviewCache,
   filingLink,
   taskRun,
   taskStageEvent,