Rename migration according to sqlx convention

migrations/20230805101911_commits.sql

@@ -0,0 +1,19 @@
+CREATE TABLE commits (
+    hash    TEXT NOT NULL PRIMARY KEY,
+    new     INT  NOT NULL DEFAULT 1,
+    tracked INT  NOT NULL DEFAULT 0
+) STRICT;
+
+CREATE TABLE commit_links (
+    parent TEXT NOT NULL,
+    child  TEXT NOT NULL,
+    PRIMARY KEY (parent, child),
+    FOREIGN KEY (parent) REFERENCES commits (hash) ON DELETE CASCADE,
+    FOREIGN KEY (child)  REFERENCES commits (hash) ON DELETE CASCADE
+) STRICT;
+
+CREATE TABLE tracked_refs (
+    name TEXT NOT NULL PRIMARY KEY,
+    hash TEXT NOT NULL,
+    FOREIGN KEY (hash) REFERENCES commits (hash) ON DELETE CASCADE
+) STRICT;