[messages] optimize database indexes

[capcom6]

Greptile Summary

The PR optimizes message lookup indexes and aligns the GORM model metadata with the new composite indexes. It also documents the intentional temporary use of the deprecated FCM token field.

• Adds indexes for message creation time and device-scoped creation time.
• Replaces the single-column hash-status index with a composite processing index.
• Adds a targeted staticcheck suppression pending FID migration.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
internal/sms-gateway/models/migrations/mysql/20260817000000_optimize_messages_indexes.sql	Adds and reverses the optimized message indexes consistently, including restoration of the prior hash-status index.
internal/sms-gateway/modules/messages/models.go	Aligns GORM metadata and composite-index column priorities with the migration.
internal/sms-gateway/modules/push/fcm/client.go	Adds a scoped lint suppression documenting the planned migration from the deprecated token field.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Q1[Created-at queries] --> I1[idx_messages_created_at]
  Q2[Device history queries] --> I2[idx_messages_device_created_at]
  Q3[Unhashed message processing] --> I3[idx_messages_unhashed]
  I3 --> C1[is_hashed]
  I3 --> C2[is_encrypted]
  I3 --> C3[state]

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_{Reviews (4): Last reviewed commit: "[lint] ignore FCM Fid migration" | Re-trigger Greptile}

[github-actions]

🤖 Pull request artifacts

Platform	File
🐳 Docker	GitHub Container Registry
🍎 Darwin arm64	server_Darwin_arm64.tar.gz
🍎 Darwin x86_64	server_Darwin_x86_64.tar.gz
🐧 Linux arm64	server_Linux_arm64.tar.gz
🐧 Linux i386	server_Linux_i386.tar.gz
🐧 Linux x86_64	server_Linux_x86_64.tar.gz
🪟 Windows arm64	server_Windows_arm64.zip
🪟 Windows i386	server_Windows_i386.zip
🪟 Windows x86_64	server_Windows_x86_64.zip