refactor

cashu/mint/migrations.py

@@ -0,0 +1,87 @@
+from cashu.core.db import Database
+
+
+async def m000_create_migrations_table(db):
+    await db.execute(
+        """
+    CREATE TABLE IF NOT EXISTS dbversions (
+        db TEXT PRIMARY KEY,
+        version INT NOT NULL
+    )
+    """
+    )
+
+
+async def m001_initial(db: Database):
+    await db.execute(
+        """
+            CREATE TABLE IF NOT EXISTS promises (
+                amount INTEGER NOT NULL,
+                B_b TEXT NOT NULL,
+                C_b TEXT NOT NULL,
+
+                UNIQUE (B_b)
+
+            );
+        """
+    )
+
+    await db.execute(
+        """
+            CREATE TABLE IF NOT EXISTS proofs_used (
+                amount INTEGER NOT NULL,
+                C TEXT NOT NULL,
+                secret TEXT NOT NULL,
+
+                UNIQUE (secret)
+
+            );
+        """
+    )
+
+    await db.execute(
+        """
+            CREATE TABLE IF NOT EXISTS invoices (
+                amount INTEGER NOT NULL,
+                pr TEXT NOT NULL,
+                hash TEXT NOT NULL,
+                issued BOOL NOT NULL,
+
+                UNIQUE (hash)
+
+            );
+        """
+    )
+
+    await db.execute(
+        """
+        CREATE VIEW IF NOT EXISTS balance_issued AS
+        SELECT COALESCE(SUM(s), 0) AS balance FROM (
+            SELECT SUM(amount) AS s
+            FROM promises
+            WHERE amount > 0
+        );
+    """
+    )
+
+    await db.execute(
+        """
+        CREATE VIEW IF NOT EXISTS balance_used AS
+        SELECT COALESCE(SUM(s), 0) AS balance FROM (
+            SELECT SUM(amount) AS s
+            FROM proofs_used
+            WHERE amount > 0
+        );
+    """
+    )
+
+    await db.execute(
+        """
+        CREATE VIEW IF NOT EXISTS balance AS
+        SELECT s_issued - s_used AS balance FROM (
+            SELECT bi.balance AS s_issued, bu.balance AS s_used
+            FROM balance_issued bi
+            CROSS JOIN balance_used bu
+        );
+    """
+    )