diff --git a/sql/registry.sql b/sql/registry.sql
new file mode 100644
index 0000000..a105a25
--- /dev/null
+++ b/sql/registry.sql
@@ -0,0 +1,60 @@
+CREATE DATABASE IF NOT EXISTS argent_registry;
+USE argent_registry;
+
+CREATE TABLE shards (
+    shard_id INT PRIMARY KEY AUTO_INCREMENT,
+    name VARCHAR(50) NOT NULL,
+    db_name VARCHAR(50) NOT NULL,
+    host_address VARCHAR(255) NOT NULL,
+    port INT NOT NULL DEFAULT 53096,
+);
+
+CREATE TABLE user_shard_map (
+    user_id CHAR(36) PRIMARY KEY,
+    username VARCHAR(50) UNIQUE NOT NULL,
+    shard_id INT NOT NULL,
+    is_active TINYINT(1) NOT NULL DEFAULT 1,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (shard_id) REFERENCES shards(shard_id)
+);
+
+CREATE TABLE cost_group_statuses (
+    status_id TINYINT PRIMARY KEY,
+    name VARCHAR(20) UNIQUE NOT NULL
+);
+
+CREATE TABLE cost_groups (
+    group_id CHAR(36) PRIMARY KEY,
+    name VARCHAR(100) NOT NULL,
+    created_by CHAR(36),
+    status_id TINYINT NOT NULL DEFAULT '1',
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    FOREIGN KEY (created_by) REFERENCES user_shard_map(user_id),
+    FOREIGN KEY (status_id) REFERENCES cost_group_statuses(status_id)
+);
+
+CREATE TABLE group_roles (
+    role_id TINYINT PRIMARY KEY,
+    name VARCHAR(20) UNIQUE NOT NULL
+);
+
+CREATE TABLE group_members (
+    group_id CHAR(36),
+    user_id CHAR(36),
+    role_id TINYINT DEFAULT '3',
+    joined_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    PRIMARY KEY (group_id, user_id),
+    FOREIGN KEY (group_id) REFERENCES cost_groups(group_id),
+    FOREIGN KEY (role_id) REFERENCES group_roles(role_id),
+    FOREIGN KEY (user_id) REFERENCES user_shard_map(user_id)
+);
+
+INSERT INTO cost_group_statuses (status_id, name) VALUES
+(1, 'active'),
+(2, 'settled'),
+(3, 'archived');
+
+INSERT INTO group_roles (role_id, name) VALUES
+(1, 'owner'),
+(2, 'editor'),
+(3, 'participant');
diff --git a/sql/shard.sql b/sql/shard.sql
new file mode 100644
index 0000000..3af3fe3
--- /dev/null
+++ b/sql/shard.sql
@@ -0,0 +1,41 @@
+CREATE DATABASE IF NOT EXISTS argent_shard_01;
+USE argent_shard_01;
+
+CREATE TABLE ledger_statuses (
+    status_id TINYINT PRIMARY KEY,
+    name VARCHAR(20) UNIQUE NOT NULL
+);
+
+CREATE TABLE ledger (
+    entry_id CHAR(36) NOT NULL,
+    batch_id CHAR(36) NOT NULL,
+    user_id CHAR(36) NOT NULL,
+    group_id CHAR(36) DEFAULT NULL,
+    category_id INT,
+    amount DECIMAL(15, 2) NOT NULL,
+    currency_code CHAR(3) NOT NULL,
+    description VARCHAR(255),
+    status_id TINYINT DEFAULT '1',
+    created_at DATETIME NOT NULL,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+
+    PRIMARY KEY (user_id, entry_id),
+    FOREIGN KEY (status_id) REFERENCES ledger_statuses(status_id),
+    INDEX (batch_id),
+    INDEX (group_id),
+    INDEX (status_id)
+);
+
+CREATE TABLE user_balances (
+    user_id CHAR(36) NOT NULL,
+    currency_code CHAR(3) NOT NULL,
+    total_confirmed DECIMAL(15, 2) DEFAULT 0.00,
+    total_pending DECIMAL(15, 2) DEFAULT 0.00,
+    PRIMARY KEY (user_id, currency_code)
+);
+
+INSERT INTO ledger_statuses (status_id, name) VALUES
+(1, 'proposed'),
+(2, 'ratified'),
+(3, 'disputed'),
+(4, 'settled');