feat(data): add list_config, task_runs tables and task config columns

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

schema/schema.sql

@@ -46,6 +46,13 @@ CREATE TABLE IF NOT EXISTS task_tags (
     PRIMARY KEY (task_id, tag_id)
 );
 
+CREATE TABLE IF NOT EXISTS list_config (
+    list_id       TEXT PRIMARY KEY REFERENCES lists(id) ON DELETE CASCADE,
+    model         TEXT NULL,
+    system_prompt TEXT NULL,
+    agent_path    TEXT NULL
+);
+
 CREATE TABLE IF NOT EXISTS worktrees (
     task_id     TEXT PRIMARY KEY REFERENCES tasks(id) ON DELETE CASCADE,
     path        TEXT NOT NULL,
@@ -57,6 +64,27 @@ CREATE TABLE IF NOT EXISTS worktrees (
     created_at  TIMESTAMP NOT NULL
 );
 
+CREATE TABLE IF NOT EXISTS task_runs (
+    id                 TEXT PRIMARY KEY,
+    task_id            TEXT NOT NULL REFERENCES tasks(id) ON DELETE CASCADE,
+    run_number         INTEGER NOT NULL,
+    session_id         TEXT NULL,
+    is_retry           INTEGER NOT NULL DEFAULT 0,
+    prompt             TEXT NOT NULL,
+    result_markdown    TEXT NULL,
+    structured_output  TEXT NULL,
+    error_markdown     TEXT NULL,
+    exit_code          INTEGER NULL,
+    turn_count         INTEGER NULL,
+    tokens_in          INTEGER NULL,
+    tokens_out         INTEGER NULL,
+    log_path           TEXT NULL,
+    started_at         TIMESTAMP NULL,
+    finished_at        TIMESTAMP NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_task_runs_task_id ON task_runs(task_id);
+
 -- Seed: minimal tag set (ignored if already present)
 INSERT OR IGNORE INTO tags (name) VALUES ('agent');
 INSERT OR IGNORE INTO tags (name) VALUES ('manual');

src/ClaudeDo.Data/SchemaInitializer.cs

@@ -26,6 +26,32 @@ public static class SchemaInitializer
         cmd.CommandText = sql;
         cmd.ExecuteNonQuery();
         tx.Commit();
+
+        ApplyMigrations(conn);
+    }
+
+    private static void ApplyMigrations(SqliteConnection conn)
+    {
+        string[] alterStatements =
+        [
+            "ALTER TABLE tasks ADD COLUMN model TEXT NULL",
+            "ALTER TABLE tasks ADD COLUMN system_prompt TEXT NULL",
+            "ALTER TABLE tasks ADD COLUMN agent_path TEXT NULL",
+        ];
+
+        foreach (var sql in alterStatements)
+        {
+            try
+            {
+                using var cmd = conn.CreateCommand();
+                cmd.CommandText = sql;
+                cmd.ExecuteNonQuery();
+            }
+            catch (SqliteException ex) when (ex.SqliteErrorCode == 1)
+            {
+                // Column already exists — safe to ignore.
+            }
+        }
     }
 
     private static string LoadScript()