Keep database snapshot tables out of the global table registries.

app/src/main/java/org/thoughtcrime/securesms/database/DatabaseTable.java

@@ -40,12 +40,14 @@ public abstract class DatabaseTable {
     this.context        = context;
     this.databaseHelper = databaseHelper;
 
-    if (this instanceof RecipientIdDatabaseReference) {
-      recipientIdDatabaseTables.add((RecipientIdDatabaseReference) this);
-    }
+    if (databaseHelper != null && databaseHelper.isPrimaryDatabase()) {
+      if (this instanceof RecipientIdDatabaseReference) {
+        recipientIdDatabaseTables.add((RecipientIdDatabaseReference) this);
+      }
 
-    if (this instanceof ThreadIdDatabaseReference) {
-      threadIdDatabaseTables.add((ThreadIdDatabaseReference) this);
+      if (this instanceof ThreadIdDatabaseReference) {
+        threadIdDatabaseTables.add((ThreadIdDatabaseReference) this);
+      }
     }
   }
 

app/src/main/java/org/thoughtcrime/securesms/database/SignalDatabase.kt

@@ -30,6 +30,8 @@ open class SignalDatabase(private val context: Application, databaseSecret: Data
   ),
   SignalDatabaseOpenHelper {
 
+  val isPrimaryDatabase: Boolean = name == DATABASE_NAME
+
   val messageTable: MessageTable = MessageTable(context, this)
   val attachmentTable: AttachmentTable = AttachmentTable(context, this, attachmentSecret)
   val mediaTable: MediaTable = MediaTable(context, this)

app/src/test/java/org/thoughtcrime/securesms/database/DatabaseTableTest.kt

@@ -0,0 +1,54 @@
+/*
+ * Copyright 2026 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.thoughtcrime.securesms.database
+
+import android.app.Application
+import androidx.test.core.app.ApplicationProvider
+import org.junit.After
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+import org.thoughtcrime.securesms.testing.JdbcSqliteDatabase
+import org.thoughtcrime.securesms.testing.TestSignalDatabase
+
+@RunWith(RobolectricTestRunner::class)
+@Config(manifest = Config.NONE, application = Application::class)
+class DatabaseTableTest {
+
+  @Before
+  fun setUp() {
+    DatabaseTable.clearTableReferencesForTests()
+  }
+
+  @After
+  fun tearDown() {
+    DatabaseTable.clearTableReferencesForTests()
+  }
+
+  @Test
+  fun snapshotDatabasesDoNotRegisterTheirTables() {
+    createDatabase(SignalDatabase.DATABASE_NAME)
+
+    val recipientTableCount = DatabaseTable.recipientIdDatabaseTables.size
+    val threadTableCount = DatabaseTable.threadIdDatabaseTables.size
+    assertTrue(recipientTableCount > 0)
+    assertTrue(threadTableCount > 0)
+
+    createDatabase("remote-signal-snapshot.db")
+
+    assertEquals(recipientTableCount, DatabaseTable.recipientIdDatabaseTables.size)
+    assertEquals(threadTableCount, DatabaseTable.threadIdDatabaseTables.size)
+  }
+
+  private fun createDatabase(name: String): TestSignalDatabase {
+    val db = JdbcSqliteDatabase.createInMemory()
+    return TestSignalDatabase(ApplicationProvider.getApplicationContext(), db, db, name)
+  }
+}

app/src/test/java/org/thoughtcrime/securesms/testing/TestSignalDatabase.kt

@@ -15,8 +15,9 @@ import net.zetetic.database.sqlcipher.SQLiteDatabase as SQLCipherSQLiteDatabase
 class TestSignalDatabase(
   context: Application,
   val supportReadableDatabase: SupportSQLiteDatabase,
-  val supportWritableDatabase: SupportSQLiteDatabase
-) : SignalDatabase(context, DatabaseSecret(ByteArray(32).apply { SecureRandom().nextBytes(this) }), AttachmentSecret(null, null, ByteArray(32).apply { SecureRandom().nextBytes(this) })) {
+  val supportWritableDatabase: SupportSQLiteDatabase,
+  name: String = SignalDatabase.DATABASE_NAME
+) : SignalDatabase(context, DatabaseSecret(ByteArray(32).apply { SecureRandom().nextBytes(this) }), AttachmentSecret(null, null, ByteArray(32).apply { SecureRandom().nextBytes(this) }), name) {
 
   constructor(context: Application, testOpenHelper: SupportSQLiteOpenHelper) : this(context, testOpenHelper.readableDatabase, testOpenHelper.writableDatabase)