Monkey patch accounts table aindex is missing

src/db.rs

@@ -851,11 +851,6 @@ impl DbAdapter {
     }
 
     pub fn get_full_backup(&self, coin: u8) -> anyhow::Result<Vec<AccountBackup>> {
-        let _ = self.connection.execute(
-            "ALTER TABLE accounts ADD COLUMN aindex INT NOT NULL DEFAULT 0",
-            [],
-        ); // ignore error
-
         let mut statement = self.connection.prepare(
             "SELECT name, seed, aindex, a.sk AS z_sk, ivk, a.address AS z_addr, t.sk as t_sk, t.address AS t_addr FROM accounts a LEFT JOIN taddrs t ON a.id_account = t.account")?;
         let rows = statement.query_map([], |r| {
@@ -1141,6 +1136,15 @@ pub struct AccountInfo {
     pub sapling_tree: String,
 }
 
+pub struct AccountData {
+    pub name: String,
+    pub seed: Option<String>,
+    pub sk: Option<String>,
+    pub fvk: String,
+    pub address: String,
+    pub aindex: u32,
+}
+
 #[cfg(test)]
 mod tests {
     use crate::db::{DbAdapter, ReceivedNote, DEFAULT_DB_PATH};
@@ -1191,12 +1195,3 @@ mod tests {
         println!("{}", balance);
     }
 }
-
-pub struct AccountData {
-    pub name: String,
-    pub seed: Option<String>,
-    pub sk: Option<String>,
-    pub fvk: String,
-    pub address: String,
-    pub aindex: u32,
-}

src/db/migration.rs

@@ -182,5 +182,23 @@ pub fn init_db(connection: &Connection) -> anyhow::Result<()> {
         log::info!("Database migrated");
     }
 
+    // We may get a database that has no valid schema version from a version of single currency Z/YWallet
+    // because we kept the same app name in Google/Apple Stores. The upgraded app fails to recognize the db tables
+    // At least we monkey patch the accounts table to let the user access the backup page and recover his seed phrase
+    let c = connection.query_row(
+        "SELECT COUNT(*) FROM pragma_table_info('accounts') WHERE name = 'aindex'",
+        params![],
+        |row| {
+            let c: u32 = row.get(0)?;
+            Ok(c)
+        },
+    )?;
+    if c == 0 {
+        connection.execute(
+            "ALTER TABLE accounts ADD aindex INTEGER NOT NULL DEFAULT (0)",
+            params![],
+        )?;
+    }
+
     Ok(())
 }