feat(session): add pairing_approved table and getPairingStore()

src/session/store.ts

@@ -1,5 +1,6 @@
 import Database from 'better-sqlite3';
 import type { Message } from '../models/types.js';
+import type { PairingStore, ApprovedSender } from '../channels/pairing.js';
 
 /** Parse a duration string like '30d', '7d', '12h' to milliseconds. Returns null if invalid or '0'. */
 export function parseDuration(s: string): number | null {
@@ -28,6 +29,13 @@ export class SessionStore {
         created_at INTEGER NOT NULL DEFAULT (unixepoch())
       );
       CREATE INDEX IF NOT EXISTS idx_messages_session ON messages(session_id);
+      CREATE TABLE IF NOT EXISTS pairing_approved (
+        channel TEXT NOT NULL,
+        sender_id TEXT NOT NULL,
+        approved_at INTEGER NOT NULL,
+        code_used TEXT NOT NULL,
+        PRIMARY KEY (channel, sender_id)
+      );
     `);
   }
 
@@ -101,6 +109,33 @@ export class SessionStore {
     return stale.map(r => r.session_id);
   }
 
+  getPairingStore(): PairingStore {
+    return {
+      loadApproved: (): ApprovedSender[] => {
+        const rows = this.db.prepare(
+          'SELECT channel, sender_id, approved_at, code_used FROM pairing_approved'
+        ).all() as Array<{ channel: string; sender_id: string; approved_at: number; code_used: string }>;
+        return rows.map(r => ({
+          channel: r.channel,
+          senderId: r.sender_id,
+          approvedAt: r.approved_at,
+          codeUsed: r.code_used,
+        }));
+      },
+      saveApproved: (sender: ApprovedSender): void => {
+        this.db.prepare(`
+          INSERT OR REPLACE INTO pairing_approved (channel, sender_id, approved_at, code_used)
+          VALUES (?, ?, ?, ?)
+        `).run(sender.channel, sender.senderId, sender.approvedAt, sender.codeUsed);
+      },
+      removeApproved: (channel: string, senderId: string): void => {
+        this.db.prepare(
+          'DELETE FROM pairing_approved WHERE channel = ? AND sender_id = ?'
+        ).run(channel, senderId);
+      },
+    };
+  }
+
   close(): void {
     this.db.close();
   }