Fix vault data loss caused by destructive migration fallback

[Copilot]

User vaults were being deleted during app updates. Room's .fallbackToDestructiveMigration() was configured to drop all tables when migrations failed or were missing, and MIGRATION_11_12 was incomplete.

Changes

Removed destructive migration

• Removed .fallbackToDestructiveMigration() from database builder
• Prevents automatic data deletion on schema mismatches

Added comprehensive migration coverage

• Implemented migrations for all version paths (1→12 through 11→12)
• Shared migrateToV12 function ensures consistent migration logic across all paths
• Defensive column/table existence checks prevent duplicate creation errors

Fixed schema gaps

• Added missing createdAt column to vault table migrations
• Added DEFAULT 0 for reconciled column in vault_contributions table
• Ensures all non-nullable columns have appropriate defaults

// Before: data loss on version mismatch
Room.databaseBuilder(...)
    .addMigrations(MIGRATION_11_12)
    .fallbackToDestructiveMigration()  // ← destroys user data
    .build()

// After: safe migrations preserve all data
Room.databaseBuilder(...)
    .addMigrations(
        MIGRATION_1_12, MIGRATION_2_12, ..., MIGRATION_11_12
    )
    .build()

All migrations now use idempotent SQL (CREATE TABLE IF NOT EXISTS, PRAGMA table_info checks) to safely handle existing schemas.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• dl.google.com
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED --add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED --add-opens=java.xml/javax.xml.namespace=ALL-UNNAMED -Xmx2048m -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.13-bin/5xuhj0ry160q40clulazy9h7d/gradle-8.13/lib/gradle-daemon-main-8.13.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.13-bin/5xuhj0ry160q40clulazy9h7d/gradle-8.13/lib/agents/gradle-instrumentation-agent-8.13.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.13 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

There is a fucking problem that keeps clearing my fucking vaults!!!! They should be permanent!!! Not disappear after 3 days!!!!

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