feat: added tables

server/src/main/kotlin/org/ccoin/database/Tables.kt

@@ -0,0 +1,69 @@
+package org.ccoin.database
+
+import org.jetbrains.exposed.sql.Table
+import org.jetbrains.exposed.sql.javatime.timestamp
+import java.math.BigDecimal
+
+object Tables {
+    object Wallets : Table("wallets") {
+        val address = varchar("address", 64) // Format random_word:random_6_digits
+        val balance = decimal("balance", 20, 8).default(BigDecimal.ZERO)
+        val label = varchar("label", 255).nullable()
+        val createdAt = long("created_at")
+        val lastActivity = long("last_activity").nullable()
+
+        override val primaryKey = PrimaryKey(address)
+
+        init {
+            index(false, createdAt)
+            index(false, lastActivity)
+        }
+    }    
+
+    object Transactions : Table("transactions") {
+        val hash = varchar("hash", 64)
+        val fromAddress = varchar("from_address", 64).nullable()
+        val toAddress = varchar("to_address", 64)
+        val amount = decimal("amount", 20, 8)
+        val fee = decimal("fee", 20, 8).default(BigDecimal.ZERO)
+        val memo = text("memo").nullable()
+        val blockHash = varchar("block_hash", 64).nullable()
+        val timestamp = long("timestamp")
+        val status = varchar("status", 20).default("pending")
+        val confirmations = integer("confirmations").default(0)
+
+        override val primaryKey = PrimaryKey(hash)
+
+        init {
+            index(false, fromAddress)
+            index(false, toAddress)
+            index(false, blockHash)
+            index(false, timestamp)
+            index(false, status)
+        }
+    }
+
+    object Blocks : Table("blocks") {
+        val hash = varchar("hash", 64)
+        val previousHash = varchar("previous_hash", 64).nullable()
+        val merkleRoot = varchar("merkle_root", 64)
+        val timestamp = long("timestamp")
+        val difficulty = integer("difficulty")
+        val nonce = long("nonce")
+        val minerAddress = varchar("miner_address", 64)
+        val reward = decimal("reward", 20, 8)
+        val height = integer("height").autoIncrement()
+        val transactionCount = integer("transaction_count").default(0)
+        val confirmations = integer("confirmations").default(0)
+
+        override val primaryKey = PrimaryKey(hash)
+
+        init {
+            index(false, height)
+            index(false, minerAddress)
+            index(false, timestamp)
+            index(false, previousHash)
+        }
+    }
+}
+