refactor(db): restructure migrations to preserve master compatibility

- Split consolidated migration into 3 separate migrations
- Preserve master's 001_initial and 002_add_iViewContent structure
- Move active_identity creation to new 003_active_identity_and_seed_backup
- Add hasBackedUpSeed field from registration-prompt-parity branch
- Remove activeDid performance index for simplified migration
- Maintain foreign key constraints and smart deletion pattern
- Remove unused $getAllAccountDids method from PlatformServiceMixin

This restructure ensures backward compatibility with master branch
while adding advanced features (active_identity table, seed backup
tracking) in a clean, maintainable migration sequence.

src/db-sql/migration.ts

@@ -36,15 +36,11 @@ const MIGRATIONS = [
   {
     name: "001_initial",
     sql: `
-      -- Enable foreign key constraints for data integrity
-      PRAGMA foreign_keys = ON;
-      
-      -- Create accounts table with UNIQUE constraint on did
       CREATE TABLE IF NOT EXISTS accounts (
         id INTEGER PRIMARY KEY AUTOINCREMENT,
         dateCreated TEXT NOT NULL,
         derivationPath TEXT,
-        did TEXT NOT NULL UNIQUE,  -- UNIQUE constraint for foreign key support
+        did TEXT NOT NULL,
         identityEncrBase64 TEXT, -- encrypted & base64-encoded
         mnemonicEncrBase64 TEXT, -- encrypted & base64-encoded
         passkeyCredIdHex TEXT,
@@ -106,8 +102,7 @@ const MIGRATIONS = [
         profileImageUrl TEXT,
         publicKeyBase64 TEXT,
         seesMe BOOLEAN,
-        registered BOOLEAN,
-        iViewContent BOOLEAN DEFAULT TRUE
+        registered BOOLEAN
       );
 
       CREATE INDEX IF NOT EXISTS idx_contacts_did ON contacts(did);
@@ -122,12 +117,23 @@ const MIGRATIONS = [
         id TEXT PRIMARY KEY,
         blobB64 TEXT
       );
+      `,
+  },
+  {
+    name: "002_add_iViewContent_to_contacts",
+    sql: `
+      ALTER TABLE contacts ADD COLUMN iViewContent BOOLEAN DEFAULT TRUE;
+    `,
+  },
+  {
+    name: "003_active_identity_and_seed_backup",
+    sql: `
+      -- Enable foreign key constraints for data integrity
+      PRAGMA foreign_keys = ON;
+      
+      -- Add UNIQUE constraint to accounts.did for foreign key support
+      CREATE UNIQUE INDEX IF NOT EXISTS idx_accounts_did_unique ON accounts(did);
       
-      CREATE TABLE IF NOT EXISTS migrations (
-        name TEXT PRIMARY KEY,
-        applied_at TEXT NOT NULL DEFAULT (datetime('now'))
-      );
-
       -- Create active_identity table with foreign key constraint
       CREATE TABLE IF NOT EXISTS active_identity (
         id INTEGER PRIMARY KEY CHECK (id = 1),
@@ -137,12 +143,20 @@ const MIGRATIONS = [
       );
 
       -- Add performance indexes
-      CREATE INDEX IF NOT EXISTS idx_active_identity_activeDid ON active_identity(activeDid);
       CREATE UNIQUE INDEX IF NOT EXISTS idx_active_identity_single_record ON active_identity(id);
 
       -- Seed singleton row
       INSERT INTO active_identity (id, activeDid, lastUpdated) VALUES (1, NULL, datetime('now'));
-      `,
+      
+      -- Add hasBackedUpSeed field to settings (from registration-prompt-parity)
+      ALTER TABLE settings ADD COLUMN hasBackedUpSeed BOOLEAN DEFAULT FALSE;
+      
+      -- Create migrations tracking table
+      CREATE TABLE IF NOT EXISTS migrations (
+        name TEXT PRIMARY KEY,
+        applied_at TEXT NOT NULL DEFAULT (datetime('now'))
+      );
+    `,
   },
 ];