Migration builder: table-level indexes, column modifiers, drop/rename/change, and fixes

[techmahedy]

Pull Request Checklist

Q	A
Branch?	4.x
Bug fix?	yes
New feature?	Yes
Deprecations?	no
Issues	-
License	MIT

Description

Summary

Brings the Doppar migration builder (Phaseolies\Database\Migration) to feature parity with the other major PHP frameworks, and fixes several bugs found along the way.

$table->string('title')->index() already worked; what was missing was table-level $table->index() (and everything around it).

Bug fixes

• SQLite silently dropped indexes. Schema::create() sent all statements in one prepare() call and SQLite runs only the first, so column ->index() / ->unique() indexes were never created. Schema now executes statements one by one via the new Blueprint::toStatements() (toSql() still works and joins them).
• Duplicate PRIMARY KEY on MySQL/PostgreSQL when ->primary() was used on a non-id column.
• String defaults were escaped with addslashes(), which is invalid on PostgreSQL/SQLite. Now escaped per driver.
• Foreign keys on SQLite are emitted inline in CREATE TABLE (SQLite cannot ALTER TABLE ADD CONSTRAINT).
• A blueprint containing only drop/rename/index commands no longer throws "No columns defined".

New features

• Indexes: index, unique, primary, fullText, spatialIndex at table level (composite, custom name, ->algorithm()); column-level ->index('name'), ->unique('name'), ->fullText(), ->spatialIndex().
• Drops/renames: dropColumn, renameColumn, dropIndex, dropUnique, dropFullText, dropSpatialIndex, dropPrimary, dropForeign, renameIndex, dropTimestamps, dropSoftDeletes, dropRememberToken, dropMorphs, dropConstrainedForeignId.
• ->change() to modify existing columns (MySQL MODIFY COLUMN, PostgreSQL ALTER COLUMN; SQLite throws a clear error).
• Column modifiers: comment, unsigned, useCurrent, useCurrentOnUpdate, autoIncrement, charset, collation, storedAs/virtualAs, invisible, first, nullable(false).
• Foreign keys: foreignId()->constrained() (table guessed from column name), foreignUuid, foreignUlid, composite keys, ->name(), noActionOnDelete/Update.
• Types/helpers: increments family, ulid, rememberToken, morphs / nullableMorphs / uuidMorphs / ulidMorphs, softDeletesTz, nullableTimestamps, precision argument on temporal columns.
• Table options: engine, charset, collation, comment, temporary.
• Schema: drop, rename, dropColumns, renameColumn, hasColumn, hasColumns, getColumnListing, hasIndex (facade docblock updated).
• Charset/collation/algorithm values are validated to prevent SQL injection through schema definitions.

Behaviour notes / compatibility

• Default index names are unchanged for single columns (idx_{table}_{col}, {table}_{col}_unique), so existing down() migrations keep working. Names over 63 chars are shortened with a hash.
• Blueprint::softDeletes() now returns the ColumnDefinition instead of void (accepts an optional column name).
• Grammar::compileCreateIndex() / compileCreateUnique() gained an optional $name parameter. Custom grammar subclasses must add it.
• PostgreSQL Database::execute() still splits on ;, so a comment containing ; would break there (pre-existing, untouched).

Docs

docs/content/docs/versions/4.x/migrations.md (docs repo) updated with all of the above. The outdated warning about needing after() when adding several columns was removed.

Checklist

• Tests have been added or updated
• Documentation has been updated if necessary
• Code follows the project coding standards
• All tests pass locally